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1. 发明专利

JPS5384443A AGC CIRCUIT 失效
公开(公告)号：JPS5384443A
公开(公告)日：1978-07-25
申请号：JP15937876
申请日：1976-12-29
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE , OKI ELECTRIC IND CO LTD , NIPPON ELECTRIC CO , HITACHI LTD
发明人： AIISO ATSUSHI , USUDA SHIYOUGO , IWATA ATSUSHI , SHIRAISHI YOSHIKATSU , UEKI ISAMU , ONO KATSUMASA
IPC分类号： H03G3/30 , H03G3/20
摘要： PURPOSE:To decrease the distortion rate as well as to accelerate the AGC action, by rectifying the output at the amplifying part which can control the amplification degree and then performing AGC control by feeding back the rectified output to the amplifying part.

2. 发明专利

JPS5327349A AGC CIRCUIT 失效
公开(公告)号：JPS5327349A
公开(公告)日：1978-03-14
申请号：JP10163876
申请日：1976-08-27
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE , OKI ELECTRIC IND CO LTD , NIPPON ELECTRIC CO , FUJITSU LTD
发明人： SAKURAI KOUJIROU , IWATA ATSUSHI , YOSHIMURA HIROSHI , HASHIZUME YUKINAO , UEKI ISAMU , TOKUDA MASAMI
IPC分类号： H04Q1/45 , H02M1/16 , H03G3/20 , H03G3/30 , H04L27/26
摘要： PURPOSE:The reduction in size is achieved with a simple circuit constitution without impairing the distortion and response time characteristics of an AGC circuit.

3. 发明专利

JPS5320710A MULTIIFREQUENCY SIGNAL RECEIVER 失效
公开(公告)号：JPS5320710A
公开(公告)日：1978-02-25
申请号：JP9511576
申请日：1976-08-10
申请人： NIPPON ELECTRIC CO , NIPPON TELEGRAPH & TELEPHONE , OKI ELECTRIC IND CO LTD , HITACHI LTD , FUJITSU LTD
发明人： UEKI ISAMU , USUDA SHIYOUGO , IWATA ATSUSHI , SHIRAISHI YOSHIKATSU , ONO KATSUMASA , TOKUDA MASAMI
IPC分类号： H04Q1/45 , H04L27/26 , H04Q1/453
摘要： PURPOSE:To improve the noise-resisting property by making the threshold follow the input level only in the signal detection block of a signal discrimination circuit and also by deciding the minimum level of the threshold.

4. 发明专利

JPS5312207A MULTIIFREQUENCY SIGNAL RECEIVER 失效
公开(公告)号：JPS5312207A
公开(公告)日：1978-02-03
申请号：JP8593476
申请日：1976-07-21
申请人： NIPPON TELEGRAPH & TELEPHONE , NIPPON ELECTRIC CO , HITACHI LTD , OKI ELECTRIC IND CO LTD , FUJITSU LTD
发明人： USUDA SHIYOUGO , IWATA ATSUSHI , HASEGAWA KOUICHI , TAKAOKA KAZUHIKO , KATAOKA MUTSUO , SASAHARA YUUJIROU
IPC分类号： H04Q1/45 , H04L27/26 , H04Q1/453
摘要： PURPOSE:To improve the SN ratio and to obtain an output of the same timing in order to prevent the malfunction, by controlling both the detector and the output control circuit using the timer circuit output for the common threshouls voltage.

5. 发明专利

JPS5323208A RECTIFIERRDETECTOR CIRCUIT 失效
公开(公告)号：JPS5323208A
公开(公告)日：1978-03-03
申请号：JP9704576
申请日：1976-08-16
申请人： OKI ELECTRIC IND CO LTD , NIPPON TELEGRAPH & TELEPHONE , NIPPON ELECTRIC CO , HITACHI LTD , FUJITSU LTD
发明人： HASHIZUME YUKINAO , USUDA SHIYOUGO , IWATA ATSUSHI , HASEGAWA KOUICHI , TAKAOKA KAZUHIKO , OSAJIMA MASAHIRO
IPC分类号： H04Q1/45 , H04L27/26 , H04Q1/453
摘要： PURPOSE:At a multi-frequency signal receiver, etc., the threshold value of an arithmetic amplifier for detection after the operation starting of rectifierdetector circuit is lowered and the control is operated by timing signals, thereby detecting signals stably.

6. 发明专利

JPS58134531A LOOP FILTER FOR PLL 失效
公开(公告)号：JPS58134531A
公开(公告)日：1983-08-10
申请号：JP1546982
申请日：1982-02-04
申请人： OKI ELECTRIC IND CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OKAMOTO SEIJI , YANAGAWA MASAHARU , KATAOKA MUTSUO , IWATA ATSUSHI
IPC分类号： H03H7/06 , H03L7/093
摘要： PURPOSE:To stabilize the output signal of a voltage-controlled oscillator by providing a pulse eliminating circuit to the output terminal of a voltage source for controlling the charging and discharging of a capacitor for integration in a loop filter. CONSTITUTION:To terminals 201 and 202 of the loop filter, difference signals from a phase comparator are supplied. If pulses are mixed with the difference signals, pulse eliminating circuits 507 and 508 detect those pulses to turn on a transistor (TR) M8 or M9. From the other terminal of the capacitor 205 for integration constituting the loop filter to the output terminal 206 of the loop filter, a voltage for eliminating appearing pulses is applied. At the output terminal of the loop filter, no influence of a pulse noise appears, so the PLL circuit oscillates stably and continuously.

7. 发明专利

JPS6086924A RECTIFICATION DETECTING CIRCUIT 失效
公开(公告)号：JPS6086924A
公开(公告)日：1985-05-16
申请号：JP19406083
申请日：1983-10-19
申请人： OKI ELECTRIC IND CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HASHIZUME YUKINAO , FUJII TERUJI , KANEKO TAKAO , KIKUCHI HIROYUKI , IWATA ATSUSHI
IPC分类号： H04B3/00 , H03H19/00 , H04B3/04
摘要： PURPOSE:To change the time constant of charge/discharge and to facilitate easy conversion of a rectification detecting circuit into an LSI, by providing an LPF of a switched capacitor film to the smooth part of the rectification detecting circuit and controlling the frequencies before and after detection of rectification for the clock pulse of said LPF. CONSTITUTION:A rectification detecting circuit rectifies an AC signal and converts it into a direct current by means of operational amplifiers 2 and 5. An LPF12 of a switched capacitor filter is provided to the smooth part of the rectification detecting circuit. At the same time, a logical circuit is provided to said detecting circuit to give a logical operation to the clock inputs given from clock input terminals 9 and 10. The clocks phi and -phi given from said logical circuit are applied to MOS transistors Tr1-Tr6 of the LPF12. Then the time during which an AC signal is supplied to the rectification detecting circuit and then detected is set freely together with the time during which the AC signal is cut off and the rectification detecting circuit is recovered. Based on these set times, the frequency of the LPF12 is controlled before and after a rectification detecting mode. Then the time constant of charge/discharge is varied to convert the rectification detecting circuit into an LSI.

8. 发明专利

JPS6072407A AC AMPLIFIER CIRCUIT 失效
公开(公告)号：JPS6072407A
公开(公告)日：1985-04-24
申请号：JP17935283
申请日：1983-09-29
申请人： OKI ELECTRIC IND CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： FUJII TERUJI , YAMAMOTO KAZUNARI , YANAGAWA MASAHARU , IWATA ATSUSHI
IPC分类号： H03F3/45 , H03F3/34
摘要： PURPOSE:To obtain a low DC offset voltage by switching the 1st and 4th switches according to the 1st clock, switching the 3rd clock with the 2nd clock whose phase is in the inverted relation to that of the 1st clock and using an output terminal of the 1st operational amplifier as a signal output so as to eliminate the use of an externally mounted component. CONSTITUTION:An AC voltage component in a signal at a signal output terminal 2 is attenuated and does not appear at an output terminal of an operational amplifier OP2, while a DC voltage component appears at the terminal as it is, when the frequency of the frequency characteristic for transmitting voltage from the signal output terminal 2 to a non-inverting input terminal of the operational amplifier OP2 is kept sufficiently lower than a lower limit value of the operating signal frequency band. As a result, the output signal component of the operational amplifier OP2 is only the DC voltage equal to the DC voltage at the signal output terminal 2 and the voltage transmission characteristic from a signal input terminal 1 to the signal output terminal 2 has a voltage gain of nearly K times in the operating frequency band in this AC amplifier circuit, where K is 1+R1/R2 and R1, R2 are resistance values of resistors R1, R2.

9. 发明专利

JPS58148517A ENCODER 失效
公开(公告)号：JPS58148517A
公开(公告)日：1983-09-03
申请号：JP3055282
申请日：1982-03-01
申请人： OKI ELECTRIC IND CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： MORI SHIGEKAZU , OKAMOTO SEIJI , TSUKAGOSHI SHIYOUSAKU , IWATA ATSUSHI
IPC分类号： H03M1/66 , H03M1/46
摘要： PURPOSE:To attain ease of circuit integration with one reference power supply, by determining the state of lower electrodes of main and sub-ladders through switching and sampling input signals again. CONSTITUTION:The main C ladders 1CA-128CA, sub-C ladders 1CB-16CB, main ladder switches SA1-SA8, and sub-ladder switches SB1-SB5 connecting one end in common respectively are provided for an encoder, and a sampling switch 103 is provided between a common connecting point of the ladders 1CA-128CA and inputs. Reset switches 201, 202 are provided between the common connecting point of the ladders 1CA-128CA and 1CB-16CB and ground, and the SA1-SA8 and SB1-SB5 are controlled with a code convesion circuit 105 with SAR. A changeover switch 200 is provided between two potential points a, b of the circuit 105, ground and a reference power supply +Vref. After the state of the lower electrodes is determined, the input signal is sampled again, allowing to simplify the constitution of the encoder.

10. 发明专利

JPS58109912A REFERENCE VOLTAGE GENERATING CIRCUIT 失效
公开(公告)号：JPS58109912A
公开(公告)日：1983-06-30
申请号：JP20703081
申请日：1981-12-23
申请人： OKI ELECTRIC IND CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： MORI SHIGEKAZU , KATAOKA MUTSUO , IWATA ATSUSHI
IPC分类号： H03F1/30 , G05F3/30
摘要： PURPOSE:To obtain a reference voltage with high accuracy, by detecting a base-to-emitter voltage and voltage difference of transistors (TRs) having different current density and setting the gain with the ratio of capacitance. CONSTITUTION:An emitter current of TRs 2, 3 consisting of a plurality of unit TRs is equal to the current of N-MOS TRs 5, 6 consisting of a plurality of the unit TRs, and this current depends on the current flowing to a TR7 via a resistor R5. The current ratio and the current density ratio of the TRs 3, 4 depend on the number of unit TRs of the TRs 3-6. In this case, a base-to-emitter voltage VBB2 if the TR4 shows a positive temperature characteristic and a DELTAVBE being the difference between a VBE1 and a VBE2 of the TR3 shows a negative temperature characteristic. An amplifier A2 where the amplification factor is determined in the ratio of the capacitances C1, C2, applies the DELTAVBE to the VBE2 with a prescribed multiple, and a reference voltage having zero temperature characteristic equal to the band gap voltage of silicon and the VBE2 are alternately outputted through the control of switches S1, S2.

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