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1. 发明专利

JPH01243726A ADM PROCESSING CIRCUIT 失效
公开(公告)号：JPH01243726A
公开(公告)日：1989-09-28
申请号：JP6952488
申请日：1988-03-25
申请人： HITACHI LTD , HITACHI TOBU SEMICONDUCTOR LTD
发明人： SHIMAZU KATSUHIRO , WATANABE KAZUO , KOMATSU TATSUYA
IPC分类号： H03M3/04
摘要： PURPOSE:To prevent a predictor from being excessively formed in a silent condition by practically making a PQ arithmetic function invalid when an encoded bit pattern is at a prescribed pattern, and adding a holding function to hold a quantizing width to a preceding value. CONSTITUTION:In a PQ arithmetic circuit, a multiplexer MPX and a holding circuit are added to a P/Q selecting part and a difference holding circuit. In a decoder circuit DCR, when the encoded bit patterns are at 011 and 100, the circuit DCR stops a P/Q selecting action, and sets the multiplexer at a holding side. Thus, the quantizing width of the preceding stage is inputted to an arithmetic circuit ALU. The arithmetic circuit ALU forms the predictor for the encoding from the output of a delay circuit D and the addition and substraction of the quantizing width by means of a PQ operation, and outputs it to a digital comparator COMP.

2. 发明专利

JPS63164617A FREQUENCY DIVISION CIRCUIT 失效
公开(公告)号：JPS63164617A
公开(公告)日：1988-07-08
申请号：JP30849886
申请日：1986-12-26
申请人： HITACHI LTD , HITACHI TOBU SEMICONDUCTOR LTD
发明人： SHIMAZU KATSUHIRO , WATANABE KAZUO
IPC分类号： H03K23/40 , H03K23/00 , H03K23/52 , H03K27/00
摘要： PURPOSE:To decrease number of components of a frequency division circuit possibly by constituting a part corresponding to a holding circuit by a biphase dynamic shift register, connecting plural stages of dynamic shift registers in a form of feedback and applying biphase oscillation to apply frequency division in the clock synchronism. CONSTITUTION:As a frequency division output COUT1 of a 1st stage frequency division circuit FF1, the period of clocks CP1, CP2 is outputted through 1/2 frequency division. Moreover, the frequency division output COUT1 of the FF1 is being frequency-divided by 1/2 each by frequency division circuits FF2, FF3 on the 2nd and succeeding stages. The holding circuit constituting the frequency divider circuit 10 of each stage is constituted by the biphase dynamic shift register in the multi-stage frequency divider circuit 10 and in addition, odd number stages of the biphase dynamic shift registers are connected in a form of feedback and frequency division is applied through biphase oscillation at the clock synchronism. Thus, the circuit inputting the frequency division input or extracting the frequency division output is constituted by having only to use one AND gate G12.

3. 发明专利

JPS62154029A MULTIPLIER CIRCUIT 失效
公开(公告)号：JPS62154029A
公开(公告)日：1987-07-09
申请号：JP29264285
申请日：1985-12-27
申请人： HITACHI TOBU SEMICONDUCTOR LTD , HITACHI LTD
发明人： SHIMAZU KATSUHIRO , WATANABE KAZUO
IPC分类号： G06F7/533 , G06F7/52 , G06F7/53
摘要： PURPOSE:To simplify the constitution of a logic circuit obtained a partial product and to speed up remarkably its action by taking a complement of '1' by the algorithm of a booth obtaining a partial product and adding '1' by a Wallence addition tree where a command taking a complement of '2' is given. CONSTITUTION:Logic operation circuits 2A-2D are constituted so as to take a '1' complement of a multiplicand X if the command taking a '2' complement of the multiplicand X is issued from decoders 1A-1D. If the command taking a '2' complement of the multiplicand X is issued from the decoders 1A-1D, it is directly inputted to an adder circuit 3 as addition data adding one to a complement '1' of the multiplicand X. When a signal C1 becomes active, the corresponding logic operation circuits 2A-2D take the complement of '1' of the multiplicand X, and simultaneously the adder circuit 3 adds outputs (AX', BX', CX' and DX') from the logic operation circuits 2A-2D according to the Wallence tree system. The adder circuit 3 adds one to the output where the signal C1 becomes active.

4. 发明专利

JPS6221325A SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE 失效
公开(公告)号：JPS6221325A
公开(公告)日：1987-01-29
申请号：JP16025285
申请日：1985-07-22
申请人： HITACHI TOBU SEMICONDUCTOR LTD , HITACHI LTD
发明人： SHIMAZU KATSUHIRO , WATANABE KAZUO
IPC分类号： H03K19/0175 , H03K19/00 , H03K19/091
摘要： PURPOSE:To prevent surely the interference among plural logic circuits formed in islands in the same semiconductor by connecting the islands of the semiconductor to a constant current source. CONSTITUTION:In connecting an output of other IIL 4 to an output N 1 of a part of a tri-state IIL 21, when an output of the IIL 4 decreases to an L level, the IIL 4 absorbs a current from an IIL 11 as shown in the arrow in solid lines to bring the input of the IIL 11 to an L level. Then the IIL 4 absorbs currents from other devices not limited to the IIL 11 only. In this case, as shown in the arrow in dotted lines, the absorbed current is supplied from the side of a constant current source 10. That is, the absorbed current required for the IIL 4 is satisfied completely by the constant current source 10. Thus, the mutual interference among plural tri-state IILs 21-2n formed in an island 102A of the same semiconductor device is prevented surely.

5. 发明专利

JPH01255321A WAVEFORM ENCODING CIRCUIT 失效
公开(公告)号：JPH01255321A
公开(公告)日：1989-10-12
申请号：JP8369888
申请日：1988-04-05
申请人： HITACHI LTD , HITACHI TOBU SEMICONDUCTOR LTD
发明人： SHIMAZU KATSUHIRO , WATANABE KAZUO
IPC分类号： H03M3/04
摘要： PURPOSE:To maintain a high sound quality, and simultaneously, to execute a substantial data compression by increasing a sampling frequency when a sound exists, and simultaneously, switching the sampling frequency, when the sound does not exist, to a low frequency. CONSTITUTION:An analog sound signal Vin is converted to a digital input signal Din by a sampling clock Fs1 of the frequency six-fold or above that of the cut-off frequency of a low-pass filter LPF1 in an analog/digital converting circuit ADC, and a signal encoded by a digital comparator COMP is made into a bit string signal by a delay group composed of a shift register RG1. When a carrier detection CD detects the fact that the sound does not exist in the bit string of the shift register RG1 two times or above, a changeover signal C2 is supplied to a sampling clock generating circuit SCG, and the sampling clock fs1 is switched to a sampling clock fs2 of the lower frequency. Thus, the high sound quality is maintained, and simultaneously, the substantial data compression can be executed.

6. 发明专利

JPS62154028A ARITHMETIC CIRCUIT 失效
公开(公告)号：JPS62154028A
公开(公告)日：1987-07-09
申请号：JP29270485
申请日：1985-12-27
申请人： HITACHI LTD , HITACHI TOBU SEMICONDUCTOR LTD
发明人： WATANABE KAZUO , SHIMAZU KATSUHIRO
IPC分类号： G06F7/00 , G06F7/38 , G06F7/52
摘要： PURPOSE:To attain an efficient arithmetic processing by adding a function which divides plural arithmetic I/O ports and operates them as an independent arithmetic I/O port. CONSTITUTION:Only when an control signal Co becomes active, an arithmetic circuit 1 operates: otherwise, the input ports X0-X7, Y0-Y7 and the output ports Po-PF are fixed in high impedance states to vacate data buses 2 and 3. Such a function that the arithmetic input ports X0-X7 and Y0-Y7 and the arithmetic output ports Po-PF are independently bisected, and the bisected ports X10-X13, Y10-Y13, X20-X23, Y20-Y23, P10-P17 and P20-P27 are independently operated by the groups is given to the arithmetic circuit 1. namely, the 1st and 2nd action modes are given to said circuit 1, and the selecting operation of the mode is executed by a control signal C1 given from the outside selects the modes.

7. 发明专利

JPS61253932A LOGIC CIRCUIT 失效
公开(公告)号：JPS61253932A
公开(公告)日：1986-11-11
申请号：JP9550885
申请日：1985-05-07
申请人： HITACHI TOBU SEMICONDUCTOR LTD , HITACHI LTD
发明人： SHIMAZU KATSUHIRO , WATANABE KAZUO
IPC分类号： H01L27/082 , H01L21/82 , H01L21/8226 , H01L27/08 , H03K19/091
摘要： PURPOSE:To reduce the mean electric power consumption of a logic circuit based upon an integrated injection logic (IIL) by controlling the earth side potential of the IIL by a logic signal. CONSTITUTION:The base of an npn bipolar transistor (TR) Qn is used as the 1st logic input (in) and its collector is used as an open type logic output (out). The common area of the base of a TR Qp and the emitter of the TR Qn is floated from an earth potential and the floated common area is used as the 2nd logic input phi. In an inactive state that the logic input phi is turned to 'H', injector current Ii flow is interrupted and a power consumption removing state is generated.

8. 发明专利

JPH04369122A D/A CONVERTER 失效
公开(公告)号：JPH04369122A
公开(公告)日：1992-12-21
申请号：JP17167091
申请日：1991-06-17
申请人： HITACHI LTD , HITACHI MICOM SYST KK , HITACHI TOBU SEMICONDUCTOR LTD
发明人： YONETANI HIROYUKI , WATANABE KAZUO , KUROSAWA YUMIO
IPC分类号： H01L21/822 , H01L27/04 , H03M1/74
摘要： PURPOSE:To improve the accuracy of linearity around a zero cross point of a current summing type D/A converter by making a difference between characteristics of two circuit components of the same shape smaller as they are located nearer the center of a semiconductor substrate and shorter in their interval. CONSTITUTION:Constant current circuit elements A1, A2, and A2, A3 are turned on/off respectively depending on a difference of conversion values when a least significant bit of a digital input value changes by one and they are arranged side by side. There appears a property that a difference of characteristics is smaller as the elements An-A1 and B1-Bn arranged in this way are located nearer the center of a semiconductor substrate 10 and their interval is shorter. Thus, without matching by laser trimming, the dispersion in the characteristic of the constant current circuit elements turned on/off around a zero cross point is reduced. Furthermore, the linearity accuracy at a minute change of each conversion value is enhanced.

9. 发明专利

JPS62194733A TRI-STATE GATE 失效
公开(公告)号：JPS62194733A
公开(公告)日：1987-08-27
申请号：JP3518386
申请日：1986-02-21
申请人： HITACHI TOBU SEMICONDUCTOR LTD , HITACHI LTD
发明人： SHIMAZU KATSUHIRO , WATANABE KAZUO
IPC分类号： H03K19/0175 , H03K17/687 , H03K19/094
摘要： PURPOSE:To strengthen the logic function without increasing the parasitic capacitance by designing the titled gate that lots of elements offering the logic function is disconnected from a bus line when the switching elements are set in the off-state, the high impedance state. CONSTITUTION:Transistors (TRs) Mps, Mns of a tri-state gate G3 provided with both a multi-input logic function and an output function of a tri-state by inserting MOS TRs Mps, Mns as switching elements to an operating power supply current path of a multi-input logic circuit G1 are connected to the output side of the circuit G1, and C-MOS TRs Mp1-Mn1, Mp2-Mn2 constituting the logic function of the circuit G1 to the power supply VCC side from the TRs Mps, Mns so as to disconnect the TRs constituting the logic function from the bus line LB when the TRs Mps, Mns are in the off-state, the high impedance output state.

10. 发明专利

JPH11103216A AUDIO POWER AMPLIFIER 失效
公开(公告)号：JPH11103216A
公开(公告)日：1999-04-13
申请号：JP26361097
申请日：1997-09-29
申请人： HITACHI LTD , HITACHI TOBU SEMICONDUCTOR LTD
发明人： YUKITA MASAHIRO , AYUKAWA KAZUHITO , TAKESHITA RITSUJI , WATANABE KAZUO
IPC分类号： H03F3/213 , H03F1/02 , H03F3/20
摘要： PROBLEM TO BE SOLVED: To prevent a beat noise fault while avoiding a ground noise on a common reference potential by providing a high output while effectively utilizing a power supply voltage at a maximum by supplying a voltage, which is boosted by using a charge pump circuit to operate with a power supply potential as a reference, to a push side driver transistor. SOLUTION: A charge pump circuit 3 alternately turns on switching transistors M4 and M5 through a control circuit 5, charges a 1st capacitor C1 with a constant voltage Vr due to a constant voltage circuit 31, transfers the charging voltage to a 2nd capacitor C2 and charges it so that a potential Vch (Vcc+Vr') higher than a power supply potential Vcc can be taken out. Since the charge pump circuit 3 is operated not with a common reference potential GND but with the power supply potential Vcc as a reference, the generation of noises on the common reference potential GND with operating can be remarkably reduced. An audio circuit applies the boosted voltage Vch to the push side driver transistor of a push/pull output step as an operating voltage.

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