Frequency-to-current converter

Details Frequency-to-current converter Frequency-to-current converter

2006-03-22

2009-12-01

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S215000, C375S294000, C375S373000, C375S375000

Reexamination Certificate

active

07627072

ABSTRACT:
A frequency-to-current converter includes a digitally selectable capacitor, a sampling capacitor, an integrator circuit and an output transconductor. The sampling capacitor is operatively coupled via a first switch to the digitally selectable capacitor. The first switch is operated by a first clock pulse from a clock generator responsive to a reference clock. The integrator circuit has an output operatively coupled via a second switch to the sampling capacitor. The integrator circuit has an output operatively coupled to a control terminal of the transistor. The second switch is operated by a second, non-overlapping clock pulse from the clock generator. A current output by the frequency-to-current converter in response to the continuous question of first and second switches is linearly proportional to the frequency of the reference clock and the capacitance of the digitally selectable capacitor.

REFERENCES:
patent: 4598251 (1986-07-01), Wehrs
patent: 5933058 (1999-08-01), Pinto et al.
patent: 6798372 (2004-09-01), Yang et al.
patent: 2004/0196171 (2004-10-01), Yang et al.

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