Switched capacitor rectifier circuit
First Claim
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1. A rectifier circuit comprising:
- an input terminal for receiving an AC input signal;
an output terminal for providing a DC output signal;
a level detector circuit connected to the input terminal for generating a control signal having a logic level indicating whether the input signal is greater than a predetermined level;
an equivalent resistance circuit connected to the input and output terminals, including,a capacitor having a first and a second plate, andswitching means that can be set in four modes for coupling the first plate to the input terminal and the second plate to the output terminal when set in a first mode, for uncoupling the first plate from the input terminal and the second plate from the output terminal when set in a second mode, for coupling the first plate to the input terminal and uncoupling the second plate from the output terminal when set in a third mode, and for uncoupling the first plate from the input terminal and coupling the second plate to the output terminal when set in a fourth mode,in which alternately setting the switching means in the first and second modes causes the equivalent resistance circuit to function as a positive resistor by charging the capacitor with a current flowing between the scond plate and the output terminal in a single direction at times when the switching means is set in the first mode, andin which alternately setting the switching means in the third and fourth modes causes the equivalent resistance circuit to function as a negative resistor by discharging the capacitor with a current flowing between the second plate and the output terminal in said single direction at times when the switching means is set in the fourth mode; and
select circuit means, responsive to the logic level of the control signal from the level detector circuit, for alternately setting the switching means in the first and second modes at times when the control signal is at one logic level, and for alternately setting the switching means in the third and fourth modes at times when the control signal is at another logic level.
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Abstract
A rectifier circuit is disclosed in which the levels of an input signal and a reference signal are compared, and the polarity of the equivalent resistor is set at positive or negative depending on the result of the comparison. The equivalent resistor is connected, as an input resistor, to a differential amplifier. A feedback resistor is connected between the input and output of the differential amplifier. This arrangement enables the rectifier circuit, with only a single differential amplifier, to perform the rectifying operation with a gain.
17 Citations
14 Claims
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1. A rectifier circuit comprising:
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an input terminal for receiving an AC input signal; an output terminal for providing a DC output signal; a level detector circuit connected to the input terminal for generating a control signal having a logic level indicating whether the input signal is greater than a predetermined level; an equivalent resistance circuit connected to the input and output terminals, including, a capacitor having a first and a second plate, and switching means that can be set in four modes for coupling the first plate to the input terminal and the second plate to the output terminal when set in a first mode, for uncoupling the first plate from the input terminal and the second plate from the output terminal when set in a second mode, for coupling the first plate to the input terminal and uncoupling the second plate from the output terminal when set in a third mode, and for uncoupling the first plate from the input terminal and coupling the second plate to the output terminal when set in a fourth mode, in which alternately setting the switching means in the first and second modes causes the equivalent resistance circuit to function as a positive resistor by charging the capacitor with a current flowing between the scond plate and the output terminal in a single direction at times when the switching means is set in the first mode, and in which alternately setting the switching means in the third and fourth modes causes the equivalent resistance circuit to function as a negative resistor by discharging the capacitor with a current flowing between the second plate and the output terminal in said single direction at times when the switching means is set in the fourth mode; and select circuit means, responsive to the logic level of the control signal from the level detector circuit, for alternately setting the switching means in the first and second modes at times when the control signal is at one logic level, and for alternately setting the switching means in the third and fourth modes at times when the control signal is at another logic level.
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11. A rectifier circuit comprising:
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an input terminal for receiving an AC input signal; an output terminal for providing a DC output signal; a level detector circuit connected to the input terminal for generating a control signal having a logic level indicating whether the input signal is greater than a predetermined level; an equivalent resistance circuit connected to the input and output terminals, including, a capacitor having a first and a second plate, and switching means, including a plurality of switches operatively connected to the first and second plates and the input and output terminals, for charging the capacitor with a current flowing between the second plate and the output terminal in a single direction at times when the switching means is set in one of a plurality of modes, and for discharging the capacitor with a current flowing between the second plate and the output terminal in said single direction at times when the switching means is set in another of the plurality of modes, wherein the equivalent resistance circuit has a positive resistance at times when the switching means is set in the one mode, and has a negative resistance at times when the switching means is set in the other mode; and select circuit means responsive to the control signal from the level detector circuit, for setting the switching means in the plurality of modes, for setting the switching means in the one mode at times when the control signal is at one logic level, and for setting the switching means in the other mode at times when the control signal is at another logic level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14)
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Specification