Effective grounding of a circuit at RF and IF

Details Effective grounding of a circuit at RF and IF Effective grounding of a circuit at RF and IF

1997-11-25

1999-12-21

Jackson, Stephen W

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 58, 361113, 361119, H02H 300

Patent

active

060057564

ABSTRACT:
A circuit for grounding a signal at a first frequency and at a second frequency. The circuit includes a first capacitor and an inductor in series and a second capacitor in parallel with the first capacitor and inductor. The first capacitor is series resonant at the first frequency and the second capacitor is series resonant at the second frequency. The inductance of the inductor is selected so the combination of the packaging inductance of the first capacitor and the inductor parallel resonants with the second capacitor at a frequency lower than the second frequency and higher than the first frequency, where the second frequency is greater than the first frequency. The grounding circuit may be used to provide a second input to a balanced RF mixer where the RF mixer receives a RF signal at the second frequency at a first input and generates an IF signal at the first frequency.

REFERENCES:
patent: 4380828 (1983-04-01), Moon
Motorola RF Device Data, Thrid Edition, Motorola Inc. 1983; pp. 4-491 (MRF644), 4-495 (MRF646) and 4-515 (MRF752).

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