Transconductance-capacitance filter with extended control range

Details Transconductance-capacitance filter with extended control range Transconductance-capacitance filter with extended control range

1995-03-14

1997-03-18

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330303, 327563, H03F 345, H03F 3191

Patent

active

056126484

ABSTRACT:
A G.sub.m -C filter is formed using transconductor elements having first and second degeneration FETs to which first and second control signals are applied. A phase-locked-loop is used to generate the control signals. The control range of the transconductor elements is increased so that the frequency response of the filter can be maintained over increased ranges of various parameters (e.g., supply voltage variations, temperature variations, etc.)

REFERENCES:
patent: 5206889 (1993-04-01), Unkrich
patent: 5227681 (1993-07-01), Koyama et al.
patent: 5541538 (1996-07-01), Bacrania et al.
Tsividis, "Integrated Continuous-Time Filer Design An Overview", IEEE Journal of Solid State Circuits, vol. 29, No. 3, Mar. 1994.
Schaumann et al., "Design of Analog Filters", Prentice Hall, Englewood Cliffs, N.J., pp. 457-485.

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