Carrier buffer having current-controlled tracking filter for spu

Details Carrier buffer having current-controlled tracking filter for spu Carrier buffer having current-controlled tracking filter for spu

1996-04-24

1998-04-07

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 8, 327156, 332127, 375376, H03L 7093, H03L 716

Patent

active

057369038

ABSTRACT:
Spurious energy suppression for a data communication system is achieved without using a large order noise suppression filter, by means of a pre-mixer tracking filter incorporated into an emitter-coupled logic configured buffer of a carrier frequency generator, using a MOSFET-implemented current-controlled resistance component of a resistor-capacitor network and an associated current control stage. The MOSFET-implemented resistance components of the filter are controlled by the same control current that establishes the carrier generator's output frequency. As a result, the cut-off frequency of the tracking filter is linearly proportional to the carrier and effectively independent of process parameters.

REFERENCES:
patent: 5512861 (1996-04-01), Sharma

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