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Multi-input voltage-to-frequency conversion circuit

  • US 8,981,816 B2
  • Filed: 05/21/2014
  • Issued: 03/17/2015
  • Est. Priority Date: 08/16/2013
  • Status: Active Grant
First Claim
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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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