Frequency modulated integrator circuit
First Claim
1. A modulated integrator circuit comprising:
- means for frequency modulating an input signal;
integrator means comprising an amplifier and an integrating capacitor switchingly connected across an input and an output of the amplifier;
storage means switchingly connected between the input and the output of the amplifier and in parallel with the integrating capacitor, said storage means being operable to store charge associated with a voltage of the output of the amplifier and to transfer said charge to the integrating capacitor to reverse the charge of the integrating capacitor in synchronism with the frequency modulation of the input signal.
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Accused Products
Abstract
A modulated integrator circuit frequency modulates an input signal and has an integrator comprised of an amplifier (31) and an intregrating capacitor (35) connected across an input and an output of the amplifier. The circuit further comprises a storage capacitor (36) in addition to any switching capacitors (C) associated with the modulation of the input signal if present. The storage means (36) is connectable between the input and the output of the amplifier in parallel with the integrating capacitor. The storage capacitor stores a charge associated with the voltage of the output of the amplifier and transfer such charge to the integrating capacitor to enable reversal of the charge of the integrating capacitor in synchronism with the frequency modulation of the input signal.
13 Citations
15 Claims
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1. A modulated integrator circuit comprising:
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means for frequency modulating an input signal; integrator means comprising an amplifier and an integrating capacitor switchingly connected across an input and an output of the amplifier; storage means switchingly connected between the input and the output of the amplifier and in parallel with the integrating capacitor, said storage means being operable to store charge associated with a voltage of the output of the amplifier and to transfer said charge to the integrating capacitor to reverse the charge of the integrating capacitor in synchronism with the frequency modulation of the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit for integrating an input signal that has been modulated with a second signal, comprising:
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an amplifier having an input and an output, said input for receiving the modulated input signal; an integrating capacitor having a first terminal connected to the input of the amplifier and a second terminal connected to the output of the amplifier; and storage means connected in parallel to said integrating capacitor across the input and output of the amplifier, said storage means inverting a charge on said integrating capacitor in synchronism with said second signal; wherein a signal at the output of the amplifier equals an integrated modulated input signal. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification