Device for amplitude adjustment and rectification made with MOS technology
First Claim
1. A full-wave rectifier which produces a full-wave rectified signal by effecting full-wave rectification on an input signal, comprising:
- an amplifier for producing a first output signal whose phase is identical to a phase of the input signal;
an inversion amplifier for producing a second output signal whose phase is reverse to the phase of the input signal; and
an output section for switching over the first output signal and the second output signal to output the full-wave rectified signal.
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Accused Products
Abstract
An amplitude adjustment device such as an amplitude compression device and amplitude expansion device is basically configured by a PWM modulator, a demodulator and an amplitude detector. Herein, the PWM modulator effects pulse-width modulation on an input signal to produce a pulse-width modulated signal, which is demodulated by the demodulator to produce an output signal. In addition, the amplitude detector detects an amplitude of a demodulated signal or an amplitude of the input signal to produce a control signal. A modulation factor of the pulse-width modulation is adjusted based on the control signal. In the case of the amplitude compression device, an input/output gain is changed inversely proportional to the amplitude of the input signal or amplitude of the output signal. Thus, it is possible to compress a dynamic range with respect to input/output characteristics. A full-wave rectifier, applicable to the amplitude adjustment device, is mainly configured by an inversion amplifier, an amplifier and an output section. Herein, the inversion amplifier amplifies an input signal with a gain of “−1”, while the amplifier amplifies it with a gain of “1”. Outputs of the amplifiers differ from each other in phases by 180°. The output section produces a full-wave rectified signal based on the outputs of the amplifiers. Incidentally, all of the amplifiers and output section are configured using field-effect transistors without using diodes being externally connected. Hence, it is possible to manufacture the full-wave rectifier in a form of an IC in accordance with the MOS process with ease.
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Citations
10 Claims
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1. A full-wave rectifier which produces a full-wave rectified signal by effecting full-wave rectification on an input signal, comprising:
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an amplifier for producing a first output signal whose phase is identical to a phase of the input signal;
an inversion amplifier for producing a second output signal whose phase is reverse to the phase of the input signal; and
an output section for switching over the first output signal and the second output signal to output the full-wave rectified signal. - View Dependent Claims (2)
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3. A full-wave rectifier comprising:
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an inversion amplifier having a first inverting input to which an input signal is applied and to which an output signal corresponding to a full-wave rectified signal is fed back, the inversion amplifier amplifying the input signal with a gain of “
−
1”
to produce a first output signal whose level is increased relatively high only in a first half duration of one period of the input signal;
an amplifier having a second inverting input to which the output signal is fed back, the amplifier amplifying the input signal with a gain of “
1”
to produce a second output signal whose level is increased relatively high only in a second half duration of one period of the input signal; and
an output section for producing a first portion of the full-wave rectified signal based on the first output signal of the inversion amplifier in the first half duration and for producing a second portion of the full-wave rectified signal based on the second output signal of the amplifier in the second half duration, wherein the first portion and the second portion are combined together to form a negative waveform for the full-wave rectified signal in response to one period of the input signal. - View Dependent Claims (4, 5, 6)
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7. A full-wave rectifier comprising:
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an amplifier having a first inverting input to which an output signal corresponding to a full-wave rectified signal is fed back, the amplifier amplifying the input signal with a gain of “
1”
to produce a first output signal whose level is reduced relatively low only in a first half duration of one period of the input signal;
an inversion amplifier having a second inverting input to which an input signal is applied and to which the output signal is fed back, the inversion amplifier amplifying the input signal with a gain of “
−
1”
to produce a second output signal whose level is reduced relatively low only in a second half duration of one period of the input signal;
an output section for producing a first portion of the full-wave rectified signal based on the first output signal of the amplifier in the first half duration and for producing a second portion of the full-wave rectified signal based on the second output signal of the inversion amplifier in the second half duration, wherein the first portion and the second portion are combined together to form a positive waveform for the full-wave rectified signal in response to one period of the input signal. - View Dependent Claims (8, 9, 10)
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Specification