AC integrated coupler with phase equalizer

Details AC integrated coupler with phase equalizer AC integrated coupler with phase equalizer

1993-10-20

1997-03-11

Lee, Benny

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333174, 379394, 379398, 379414, H03H 1104

Patent

active

056105649

ABSTRACT:
A monolithically integrated AC coupling circuit is presented for DC uncoupling and AC coupling (typically in telephone applications) to an input signal. The AC coupler includes a high-pass filter having a first pole at a frequency well below a frequency of interest and a zero at zero frequency. The AC coupler also includes a pole/zero doublet between the frequency of the first pole and the frequency of interest. The frequency of the first pole for a specified error is increased by addition of the doublet. Because the frequency of the first pole is increased, the size of the required capacitors is decreased, enabling integration. An implementation of the circuit using switched capacitor techniques is described. An alternative circuit employing a unit gain interface is presented. The alternative circuit reduces the dynamic range and driving voltage requirements of its field-effect transistors.

REFERENCES:
patent: 3114117 (1963-12-01), Anderson
patent: 4801888 (1989-01-01), Haque
Hosticka et al., "MOS Sampled Data Recursive Filters Using Switched Capcitor Integrators," IEEE Journal of Solid-State Circuits, vol. SC-12, No. 6, Dec. 1977, pp. 600-608.
Dielacher et al., "A Software Programmable CMOS Telephone Circuit," IEEE Journal of Solid State Circuits 26:1015-1026, 1991. See p. 1021, left col., line 4; p. 1024, left col. line 9, figs. 1, 11-15 No Month.

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