Precision full-wave rectifier circuit for high-density, low-power implantable medical device
First Claim
1. A voltage rectifying circuit comprising:
- a source signal input coupled to a first input of a polarity judgment circuit and to a first input of a switching circuit;
a reference signal input coupled to a second input of the polarity judgment circuit and to a second input of the switching circuit;
the polarity judgment circuit having an output connected to a first control input of the switching circuit;
the switching circuit having a first output connected to a first non-inverting input of a DDA, and a second output connected to a first inverting input of the DDA;
the reference signal connected to a second non-inverting input of the DDA; and
, the DDA having an output connected to a second inverting input of the DDA.
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Accused Products
Abstract
A precision voltage rectifier comprises a source voltage input and a voltage reference. The rectifier comprises switching elements that, according to the sign of the source signal, change the connections to the inputs of a differential difference amplifier that is connected as a voltage inverter. Embodiments of the invention are fully-integrated and CMOS compatible with high-input impedance such that the invention can be operated in low-power situations. A preferred application involves the integration of several similar circuits in a high-density, low-power implantable medical device. Particular embodiments of the invention can be used to rectify nerve signals collected by electrodes for use in a system for manipulating a prosthetic device.
11 Citations
19 Claims
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1. A voltage rectifying circuit comprising:
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a source signal input coupled to a first input of a polarity judgment circuit and to a first input of a switching circuit;
a reference signal input coupled to a second input of the polarity judgment circuit and to a second input of the switching circuit;
the polarity judgment circuit having an output connected to a first control input of the switching circuit;
the switching circuit having a first output connected to a first non-inverting input of a DDA, and a second output connected to a first inverting input of the DDA;
the reference signal connected to a second non-inverting input of the DDA; and
,the DDA having an output connected to a second inverting input of the DDA. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for rectifying a source signal, the method comprising:
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comparing a voltage of a source signal voltage with a voltage of a reference signal;
when the voltage of the source signal is greater than the voltage of the reference signal, connecting the source signal to a first input of a first differential pair of a DDA, and connecting the reference signal to a second input of the first differential pair;
when the voltage of the source signal is less than the voltage of the reference signal, connecting the reference signal to the first input of the first differential pair and connecting a primary signal to the second input of the first differential pair;
connecting the reference signal to a second non-inverting input of a second differential pair of the DDA; and
,connecting an output of the DDA to a second inverting input of the second differential pair. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification