Slimmer circuit technique

Details Slimmer circuit technique Slimmer circuit technique

1993-01-27

1994-02-01

Wambach, Margaret R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307494, 307267, 328127, 328162, 328168, H03K 1716

Patent

active

052834832

ABSTRACT:
A fast parasitic-insensitive continuous-time filter and equalizer integrated circuit that uses an active integrator is described. Circuit techniques for excess-phase cancellation, and for setting the corner-frequency of the filter and equalizer are also described. These techniques result in a filter and equalizer chip with performance independent of process, supply, and temperature without employing phase-lock loops. This 20MHz 6th order Bessel filter and 2nd order equalizer operate from 5V, and generate only 0.24% (-52 dB) of total harmonic distortion when processing 2 Vp-p differential output signals. The device is optimized to limit high-frequency noise and to amplitude equalize the data pulses in hard disk read-channel systems. The device supports data rates of up to 36 Mbps, and is built in a 1.5.mu./4 GHz BiCMOS technology.

REFERENCES:
R. Castello, et al., "A Very Linear BiCMOS Transconductor for High-Frequency Filtering Applications", Proceedings of ISCAS 1990, pp. 1364-1367.
S. L. Wong, "Novel Drain-Biased Transconductance Building Blocks for Continuous-Time Filter Applications", Electronics Letters, vol. 25, No. 2, Jan. 1989, pp. 100-101.
G. A. DeVeirman, et al., "A 27 MHZ Programmable Bipolar 0.05.degree. Equiripple Linear-Phase Lowpass Filter", ISSCC Digest of Technical Papers, Feb. 1992.
C. A. Laber, et al., "Design Considerations for a High-Performance 3 .mu.m CMOS Analog Standard Cell Library", IEEE Journal of Solid-State Circuits, vol. SC-22, No. 2, pp. 181-189, Apr. 1987.
C. A. Laber and P. Gray, "A 20MHZ 6th Order BICMOS Programmable Filter Using Parasitic-Insensitive Integrators", Symposium on VLSI Circuits, Digest of Technical Papers, Seattle, Washington, Jun. 1992.
C. F. Chiou and R. Schaumann, "Design and Performance of a Fully Integrated Bipolar 10.7-MHz Analog Bandpass Filter", IEEE Journal of Solid-State Circuits, vol. SC-21, No. 1, pp. 6-14, Feb. 1986.
ML6006 Data Sheet, 36 Mbps Read Channel Filter/Equalizer, Micro Linear Corporation, San Jose, California, pp. 5-221-5-230, Jul. 1992.

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