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JPS57203315A |
PURPOSE: To reduce the capacity of a buffer register, by reading the filter coefficient in plural times into the buffer register within a single unit operation time and then applying the filter coefficient to a characteristic variable sw...
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JPS57203314A |
PURPOSE: To realize a small size and a low cost of a circuit system, by forming an LPF for elimination of the folded noise within the same IC chip of a switched capacitor filter. CONSTITUTION: A switched capacitor filter SCF302 consistin...
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JPS57192118A |
PURPOSE: To reduce the volume of an LSI chip, by constituting the circuit that no holding capacitor is required in a switched capacitor circuit. CONSTITUTION: One end of a switched capacticor circuit 10 is connected to an input terminal ...
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JPS57178413A |
PURPOSE: To obtain a desired transfer function, to reduce the size of a transmission system circuit, and to simplify the circuit by determining whether input terminals are applied with input signals or a reference potential through the s...
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JPS57160212A |
PURPOSE: To obtain a small coefficient value by using relatively large capacity by performing charge transfer by varying the ratio of input capacity and integral capacity according a filter coefficient supplied externally. CONSTITUTION: ...
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JPS57152855U |
A small-sized LSI variable equalizer is provided for accurately equalizing waveforms of signals transmitted via transmission lines of different distances. Variable equalizer units capable of stepwise changing the equalizing characteristi...
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JPS57154925A |
PURPOSE: To set the optional characteristics for a switched capacitor filter (SCF), by transferring selectively the electric charge of plural capacitors to an integrating capacitor based on a binary weight coefficient. CONSTITUTION: Samp...
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JPS57154926A |
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JPS57143708U |
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JPS57143917A |
PURPOSE: To reduce characteristics that an operational amplifier requires, by advancing or delaying the timing of the input and output switching of the operational amplifier by a half period. CONSTITUTION: Switches 1 and 2 on the input a...
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JPS57141420U |
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JPS57132418A |
PURPOSE: To make sharpness of a frequency characteristic and finite setting of a transient response compatible, by a simple constitution which is combined a dead time element with an integral control element. CONSTITUTION: A dead time el...
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JPS57131114A |
PURPOSE: To realize various characteristics by use of one operational amplifier, by controlling a peripheral capacitor group so that the operational amplifier is used for the time division multiplex. CONSTITUTION: A time area for control...
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JPS57127323A |
PURPOSE: To increase the filter characteristics and to improve the space coefficient, by setting nearly the same integral constant for integrators of higher- order switched capacitor filters. CONSTITUTION: The integral constant of switch...
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JPS57119510A |
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JPS5732490B2 |
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JPS57103419A |
PURPOSE: To reject easily and surely frequency components of an input signal, by operating the difference between the output of a digital filter and the input signal by a subtracting circuit. CONSTITUTION: An input signal is applied to t...
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JPS5729324B2 |
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JPS5799816A |
PURPOSE: To obtain an optional filter characteristic easily by an external resistance or capacitor, by connecting a voltage dividing means to a capacitor for samping a signal charge to apply a divided voltage. CONSTITUTION: A phase inver...
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JPS5799015A |
An improved duty cycle controlled filter, wherein a resistance is included in every circuit path that exists between a switch terminal and an amplifier terminal. Such improved filter produces low distortion and has been found to be espec...
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JPS5727612B2 |
Signal attenuation by commutating capacitor units combined in tandem band rejection filter sections is enhanced by driving the units in different phases for commutating capacitor connections in the respective units.
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JPS5784613A |
PURPOSE: To obtain an output signal in phase with an input with a simple constitution, by inputting the input signal to a negative input terminal of an integrator via a switched capacitor. CONSTITUTION: The relation between a switched ca...
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JPS5780851A |
PURPOSE: To form an FSK demodulating circuit of different specifications by switching clocks, by using a switched capacitor filter (SCF) as a pre-band pass filter. CONSTITUTION: A receiving signal is inputted to an SCR19 through a microp...
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JPS5780821A |
PURPOSE: To obtain small resistance with a small circuit element, by doubling a capacity constituting a switched capacitor apparently to reduce the capacity value on an IC chip. CONSTITUTION: Connections of contacts of switches 3 and 5 a...
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JPS57500809A |
The subject sampling filter employs fractional period displacement of samples to force additional nulls in the filter characteristic response. This sampling method and cascading antialiasing filters provides a filter structure which mini...
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JPS5770597A |
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JPS5767312A |
PURPOSE: To simplify the constitution, by driving a variable band filter by a clock signal obtained from the output of a voltage control oscillator (VCO). CONSTITUTION: Under the state where a signal of a constant frequency is applied to...
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JPS5753916A |
PURPOSE: To obtain the highly accurate, compact transformer, by forming two coils comprising spiral conductor patterns, wherein width and thickness of the conductor and the interval between the conductor parts are specified, on an insula...
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JPS5714499B2 |
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JPS5748731U |
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JPS5743630U |
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JPS5723625U |
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JPS573418A |
An integrator with a sampling stage at the input side has a first capacitor with associated electronic switches and has one or more amplifier stages each having a feedback path containing a second capacitor which is connected to the outp...
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JPS56169413A |
PURPOSE: To prevent the deterioration of characteristics, by connecting a compensating switch to a switch connected with a capacitor having inverse element sensitivity as that of a filter consisting of a stray capacitance of the switch s...
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JPS56157115A |
PURPOSE: To prevent an increase of voltage for the output of each integrator, by using a capacitor having a constant transmission function of an equivalent leapfrog type active filter and decided with different resistance values for an L...
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JPS5648807B2 |
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JPS56143719A |
PURPOSE: To obtain a switched capacitor inductance having a small internal gain by providing capacitors, equipped with a rotary switch across each one, at the input and output sides of an operational amplifier. CONSTITUTION: Numbers of r...
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JPS56129419A |
PURPOSE: To form a new analog signal delay circuit which can be used in place for a delay circuit using charge transfer elements, by the application of a switched capacitor. CONSTITUTION: A plurality of memory cells M1∼Mn in parallel c...
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JPS56126310A |
PURPOSE: To obtain the sine wave type filter characteristics and thus miniaturize a switched capacitor filter, by providing a switch that performs a control with the 1st phase clock plus a switch that performs a control with the 2nd phas...
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JPS56126311A |
PURPOSE: To obtain an output of integration that is free from a stray capacity, by providing a switch which performs a control with the fist phase clock plus a switch which performs a control with the second phase clock centering on the ...
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JPS5641010B2 |
A band pass filter circuit for a band pass filter comprises a phase detector connected to the band pass filter for determining the difference in phase between input and output signals of the band pass filter. A voltage controlled oscilla...
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JPS56120213A |
PURPOSE: To realize the filter suitable up to high frequency region, by containing a bipolar chip including operational amplifiers and MOS chip including switch group and driving circuit driving the switch group, in one IC package. CONST...
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JPS56115019A |
PURPOSE: To secure a steady filter characteristics over a wide range, by constituting each of the LCR elements with a passive circuit formed by combining a capacitor and a switch plus a circuit that delivers the mean value of the output ...
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JPS5639148B2 |
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JPS56114112U |
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JPS56107621A |
PURPOSE: To obtain a delay line having a small size and low cost with an easy control plus a steady delay time, by using a switched capacitor circuit and thus requiring no LC element. CONSTITUTION: A switched capacitor delay line is form...
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JPS56103514A |
PURPOSE: To reduce the higher harmonic disturbance, by providing at the front stage of the 1st mixer a filter which switches in accordance with the frequency of reception for the VHF low band, VHF high band and UHF band, respectively. CO...
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JPS5698023A |
PURPOSE: To obtain a higher harmonic filter which operates accurately to an integer-fold frequency compared with the basic frequency and has an appropriately high Q with a high speed of response, by supplying a frequency obtained by mult...
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JPS5669123U |
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JPS5664514A |
PURPOSE: To obtain an easy-to-control filter having no reduction of the general impedance, by actuating plural filters connected in parallel in a seccessive switching by the time division. CONSTITUTION: The input signal is supplied to th...
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