Multi-input voltage-to-frequency conversion circuit
First Claim
1. A multi-input voltage-to-frequency conversion circuit comprising:
- a multi-input operational amplifier having a plurality of control ends used to respectively receive a plurality of external control signals, a plurality of non-inverting input ends used to respectively receive a plurality of voltage signals, an inverting input end for receiving a negative feedback voltage, and an output end, said multi-input operational amplifier being operable to amplify one of the voltage signals in response to the control signals so as to output an amplified voltage at said output end, the negative feedback voltage being associated with the amplified voltage;
a voltage-to-current converter coupled to said inverting input end and said output end of said multi-input operational amplifier for receiving the amplified voltage from said output end and for providing the negative feedback voltage to said inverting input end, said voltage-to-current converter being operable to convert the amplified voltage into a sensed current and to generate an oscillation current based on the sensed current; and
on an offset voltage that is associated with a predetermined frequency range corresponding to said one of the voltage signals; and
a current-controlled oscillator coupled to said voltage-to-current converter for receiving the oscillation current therefrom, said current-controlled oscillator being operable to generate, based on the oscillation current, a periodic pulse signal that has a frequency linearly proportional to the magnitude of said one of the voltage signals.
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Abstract
A multi-input voltage-to-frequency conversion circuit, includes: a multi-input operational amplifier amplifying one of multiple voltage signals in response to multiple control signals to generate an amplified voltage; a voltage-to-current converter converting the amplified voltage into a sensed current, and generating an oscillation current based on the sensed current and on an offset voltage that is associated with a predetermined frequency range corresponding to the one of the voltage signals; and a current-controlled oscillator generating, based on the oscillation current, a periodic pulse signal that has a frequency linearly proportional to the magnitude of the one of the voltage signals.
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Citations
10 Claims
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1. A multi-input voltage-to-frequency conversion circuit comprising:
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a multi-input operational amplifier having a plurality of control ends used to respectively receive a plurality of external control signals, a plurality of non-inverting input ends used to respectively receive a plurality of voltage signals, an inverting input end for receiving a negative feedback voltage, and an output end, said multi-input operational amplifier being operable to amplify one of the voltage signals in response to the control signals so as to output an amplified voltage at said output end, the negative feedback voltage being associated with the amplified voltage; a voltage-to-current converter coupled to said inverting input end and said output end of said multi-input operational amplifier for receiving the amplified voltage from said output end and for providing the negative feedback voltage to said inverting input end, said voltage-to-current converter being operable to convert the amplified voltage into a sensed current and to generate an oscillation current based on the sensed current; and
on an offset voltage that is associated with a predetermined frequency range corresponding to said one of the voltage signals; anda current-controlled oscillator coupled to said voltage-to-current converter for receiving the oscillation current therefrom, said current-controlled oscillator being operable to generate, based on the oscillation current, a periodic pulse signal that has a frequency linearly proportional to the magnitude of said one of the voltage signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification