Single-ended-to-differential converter with common-mode...

Details Single-ended-to-differential converter with common-mode... Single-ended-to-differential converter with common-mode...

2005-03-29

2005-03-29

Shingleton, Michael B. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S117000, C330S301000, C330S307000, C330S284000, C327S307000, C327S346000

Reexamination Certificate

active

06873210

ABSTRACT:
Provided is a circuit to perform single-ended to differential conversion while providing common-mode voltage control. The circuit includes a converter to convert a single-ended signal to a differential signal and a stabilizing circuit adapted to receive the differential signal. The stabilizing circuit includes a sensor configured to sense a common-mode voltage level of the differential signal and a comparator having an output port coupled to the converter. The comparator is configured to compare the differential signal common-mode voltage level with a reference signal common-mode voltage level and produce an adjusting signal based upon the comparison. The adjusting signal is applied to the converter via the output port and is operative to adjust a subsequent common-mode voltage level of the differential signal.

REFERENCES:
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patent: 5049831 (1991-09-01), Westwick
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patent: 6118322 (2000-09-01), Bockelman et al.
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patent: 58057806 (1983-04-01), None
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Wu et al., New Fully Differential HF CMOS OP Amps With Efficient Common Mode Feedback, IEEE International Symposium on Circuits and Systems, vol. 3, May 8-11, 1989, pp. 2076-2079.
Duque-Carrillo, “Input Common-Mode Feedback Technique for Very Low Voltage CMOS Amplifiers,” IEEE Circuits and Systems, vol. 2, May 30, 1999 to Jun. 2, 1999, pp. 25-28.
European Search Report issued Sep. 3, 2004 for Appln. No. EP 03 00 6954, 3 pages.

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