Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Converting input current or voltage to output frequency
Utility Patent
1999-06-23
2001-01-02
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Converting input current or voltage to output frequency
C327S074000, C327S157000
Utility Patent
active
06169428
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of voltage to frequency converters.
2. Prior Art
Voltage to frequency converters of various kinds are known in the prior art. One type of such converter uses a current source or current sources triggered by one-shot devices to provide a charge equal to I * &Dgr;T as a restoring force to an input integrator. The present invention provides an alternate design readily fabricated in integrated circuit form, operating on a single voltage supply, having high performance, and being capable of operating on input signals both above and below circuit ground.
BRIEF SUMMARY OF THE INVENTION
A voltage to frequency converter using a charge pump to restore the output voltage of the input integrator. The charge pump implementation allows the voltage to frequency converter's input to sense voltage above and below ground with a single supply using a charge pump, which can provide either a positive charge or a negative charge as the restoring force to the integrator. Inclusion of an interleaved charge pump provides advantages of implementation simplicity and of high performance. The voltage to frequency converter concentrates all offset and leakage errors at the input of the integrator amplifier, which in the preferred embodiment is a chopper stabilized amplifier providing very low offset. The voltage to frequency converter is intended for realization in integrated circuit form, providing very high performance in an integrated circuit having very low power requirements.
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Blakely , Sokoloff, Taylor & Zafman LLP
Lam Tuan T.
Maxim Integrated Products Inc.
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