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1. 发明授权

US4004161A Rectifying circuits 失效
标题翻译：整流电路
公开(公告)号：US4004161A
公开(公告)日：1977-01-18
申请号：US626144
申请日：1975-10-28
申请人： Alan Ryder
发明人： Alan Ryder
IPC分类号： G01R19/22 , H02M7/217
CPC分类号： G01R19/22
摘要： A rectifying circuit comprises a high gain A.C. amplifier having first and second rectifying means connected in respective negative feedback paths between its output and its input and arranged to pass respective feedback currents of opposite polarity. A current copying device is responsive to the current flowing in one of the rectifying means to copy this current.In a preferred embodiment, said one rectifying means comprises the base-emitter junction of a first transistor, whose collector is connected to the input of the amplifier, and the current copying means comprises a second transistor, matched with the first transistor, and having its base-emitter junction connected in parallel with the base-emitter junction of the first transistor. The rectified output signal in this embodiment is taken from the free collector of the second transistor.
摘要翻译：整流电路包括高增益A.C.放大器，其具有连接在其输出端与其输入端之间的各个负反馈路径中的第一和第二整流装置，并布置成通过相反极性的相应反馈电流。当前的复印装置响应于在一个整流装置中流动的电流来复制该电流。

2. 发明授权

US4868494A Methods and apparatus for frequency response analysis 失效
标题翻译：频率响应分析方法与装置
公开(公告)号：US4868494A
公开(公告)日：1989-09-19
申请号：US153404
申请日：1988-02-08
申请人： Alan Ryder , Brian Sayers
发明人： Alan Ryder , Brian Sayers
IPC分类号： G01R27/28 , G01R23/16
CPC分类号： G01R23/16
摘要： In a frequency response analyser for operation at high frequencies a signal of frequency F for application to a system under test (15) is generated from a frequency synthesizer (11) capable of operation only at a relatively lower frequency F/K by generating a first signal (19) of frequency at the relatively lower frequency F/K by generating a second signal 104 at the relatively higher frequency (f+F) and generating a third signal (at 114) or F(1--1/K). The second signal is applied to the system under test and an output signal (at 16) derived therefrom. The output is multiplied by the third signal to provide a product signal, and the product signal is analyzed with respect to first signal by means of a correlator 14. The present invention overcomes the limitation in maximum testing frequency imposed by the frequency synthesizers of prior art frequency response analyzers.

3. 发明授权

US4510440A Methods and apparatus for frequency response analysis 失效
标题翻译：频率响应分析方法与装置
公开(公告)号：US4510440A
公开(公告)日：1985-04-09
申请号：US445791
申请日：1982-12-01
申请人： Alan Ryder
发明人： Alan Ryder
IPC分类号： G01R27/28 , G01R23/16
CPC分类号： G01R23/16
摘要： In a heterodyning arrangement to enable frequency response testing of a system at a high frequency F using a digital correlator capable of operation at a lower frequency F/h, an offset signal is generated at a frequency F(h-1)/h and multiplied with the output signal of the system under test. Two heterodynes result: a wanted signal at a frequency F/h, and an unwanted image signal at F(2h-1)/h. The value of h is selectable independently of a divisor N which controls derivation of the test frequency F from a frequency synthesizer operating at a frequency NF. Thus the frequency of the image signal can be arranged to avoid spurious non-zero responses in the digital correlation process at frequencies related to N.
摘要翻译：在使用能够以较低频率F / h操作的数字相关器使得能够以高频F对系统进行频率响应测试的外差装置中，以频率F（h-1）/ h产生偏移信号并相乘与被测系统的输出信号。两个外差的结果是：频率为F / h的有用信号和F（2h-1）/ h处的不需要的图像信号。 h的值可以独立于从频率为NF的频率合成器导出测试频率F的除数N来选择。因此，可以设置图像信号的频率以避免在与N相关的频率的数字相关处理中的杂散非零响应。

4. 发明授权

US4916383A Frequency response analysis 失效
标题翻译：频率响应分析
公开(公告)号：US4916383A
公开(公告)日：1990-04-10
申请号：US344927
申请日：1989-04-28
申请人： Brian Sayers , Alan Ryder , Steve Outram
发明人： Brian Sayers , Alan Ryder , Steve Outram
IPC分类号： G01R23/16
CPC分类号： G01R23/16
摘要： In a frequency response analyzer capable of testing a system under test at a higher frequency F derived from a signal generator providing a relatively higher frequency F/K. A reference signal of frequency F-C is supplied to a mixer where it is multiplied with the return signal of frequency F to provide a fixed frequency output C. An analyzing portion of the frequency response analyzer is therefore required to operate only at this fixed frequency C and may provide an output in any suitable form, for example displays of magnitude and phase against frequency as F/K is varied. The present invention overcomes the problem of providing a VCO based signal generator capable of operation at very low frequencies.

5. 发明授权

US5019817A Analogue-to-digital converter 失效
标题翻译：模数转换器
公开(公告)号：US5019817A
公开(公告)日：1991-05-28
申请号：US567144
申请日：1990-08-14
申请人： Alan Ryder
发明人： Alan Ryder
IPC分类号： H03M1/16 , H03M1/52
CPC分类号： H03M1/162 , H03M1/52
摘要： A multiple ramp analogue-to-digital converter comprises an integrator connected to receive and integrate an analogue input signal to be converted, and an opposing coarse reference signal. Instead of these signals being applied to the integrator sequentially, as is conventional, they are applied simultaneously. A flash converter is used to provide a rough initial estimate of the magnitude and polarity of the analogue input signal, so that the duration of application of the coarse reference signal can be estimated in advance. A fine reference signal is then applied to the integrator to restore its output to zero and improve the resolution of the conversion.

6. 发明授权

US4868487A Frequency response analyser with multiplying digital to analogue converter 失效
标题翻译：具有倍增数模转换器的频率响应分析仪
公开(公告)号：US4868487A
公开(公告)日：1989-09-19
申请号：US121356
申请日：1987-11-16
申请人： Alan Ryder
发明人： Alan Ryder
IPC分类号： G01R23/16 , G01R27/28
CPC分类号： G01R27/28 , G01R23/16
摘要： In apparatus for performing frequency response analysis of a system under test to establish response coefficients at various frequencies, a look up Read Only Memory is sequentially addressed to give a driving signal. The signal received from a system under test is fed to the analogue input of a multiplying digital to analogue converter, the digital input being fed from a Read Only Memory, storing values of a reference waveform (e.g., sin wt), by which the received signal is multiplied. The integration period of the multiplying digital to analogue converter is selected such that unwanted multiplication products integrate out, leaving the response coefficient at the reference frequency. For speed, a second channel may be used to establish the orthogonal coefficient. Methods are proposed so that the arrangement operates with single or two quadrant multiplying digital to analogue converters and to select harmonic coefficients.
摘要翻译：在用于对被测系统进行频率响应分析以建立各种频率的响应系数的装置中，依次寻址查找只读存储器以给出驱动信号。从被测系统接收到的信号被馈送到乘法数模转换器的模拟输入端，该数字输入从只读存储器馈送，存储参考波形（例如，sin wt）的值，由此接收信号相乘。选择乘法数模转换器的积分周期，使不想要的乘法积分输出，使响应系数处于参考频率。为了速度，可以使用第二通道来建立正交系数。提出了一种方法，使得该装置以单或双象限乘法数模转换器运行并选择谐波系数。

7. 发明授权

US3978402A Apparatus for producing an electrical output signal whose magnitude is linearly representative of the value of an unknown resistance 失效
标题翻译：用于生产电气输出信号的装置，其中的电压是线性表示未知电阻的值
公开(公告)号：US3978402A
公开(公告)日：1976-08-31
申请号：US553378
申请日：1975-02-26
申请人： Alan Ryder
发明人： Alan Ryder
IPC分类号： G01R19/255 , G01R27/14 , H03M1/00 , G01R27/02
CPC分类号： G01R27/14 , H03M1/52 , H03M1/62
摘要： In a DVOM of the dual slope type, an unknown resistance or conductance to be measured is connected to a reference signal source to generate a voltage or current which is measured by the DVOM. However, if the input impedance of the DVOM is not extremely high, it loads the unknown resistance or conductance, and renders the relationship between the value of the unknown resistance or conductance and the actual voltage or current measured by the DVOM non-linear. In order to correct for this, a proportion of this actual voltage or current is algebraically summed with the reference signal used in the DVOM for generating the second slope of its dual slope operation, the proportion being selected in dependence on the input impedance of the DVOM (which can thus now take any convenient value) to linearize the relationship between the value of the unknown resistance or conductance and the output signal of the DVOM.

8. 发明授权

US3976896A Reference voltage sources 失效
标题翻译：参考电压源
公开(公告)号：US3976896A
公开(公告)日：1976-08-24
申请号：US626143
申请日：1975-10-28
申请人： Alan Ryder
发明人： Alan Ryder
IPC分类号： G05F3/30 , H03M1/00 , H03K1/12
CPC分类号： G05F3/30 , H03M1/0604
摘要： A bipolar reference voltage source comprises first and second ratio-matched transistors having respective collector load resistors and arranged to pass slightly different currents. The emitter of the first transistor is connected to two emitter resistors in series, while the emitter of the second is connected to the junction between the emitter resistors. The bases of the transistors are commoned, while their collectors are respectively connected to the two inputs of a differential amplifier. A switching arrangement has a first state in which the output of the differential amplifier is connected to the bases of the transistors, and the end of the two emitter resistors remote from the transistors is grounded, thereby producing a first reference voltage of one polarity at the output of the differential amplifier. The switching arrangement has a second state in which the output of the differential amplifier is connected to the end of the two emitter resistors remote from the transistors, the bases of the transistors are grounded and the polarity of the gain of the differential amplifier is reversed, thereby producing a second reference voltage, equal in magnitude but opposite in polarity to the first, at the output of the differential amplifier.
摘要翻译：双极参考电压源包括具有相应的集电极负载电阻器的第一和第二比例匹配晶体管，并且布置成通过略微不同的电流。第一晶体管的发射极连接到串联的两个发射极电阻，而第二晶体管的发射极连接到发射极电阻之间的结。晶体管的基极是共同的，而它们的集电极分别连接到差分放大器的两个输入端。开关装置具有第一状态，其中差分放大器的输出连接到晶体管的基极，并且远离晶体管的两个发射极电阻的端部接地，从而在第一状态下产生一个极性的第一参考电压输出差分放大器。开关装置具有第二状态，其中差分放大器的输出端连接到远离晶体管的两个发射极电阻的端部，晶体管的基极接地，差分放大器的增益极性反转，从而在差分放大器的输出处产生第二参考电压，其幅度与第一参考电压的极性相等。

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