Oscillators – Solid state active element oscillator – Transistors
Patent
1975-04-01
1976-05-11
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
58 23A, 331108D, H03B 536
Patent
active
039567141
ABSTRACT:
A piezoelectric crystal has an energizing circuit including a low-voltage supply battery connected across two parallel pairs of series-connected field-effect transistors of the insulated-gate type, the junction of each FET pair being tied to a tap of a respective capacitive voltage divider which lies between a reference pole of the battery and a respective terminal of a piezoelectric crystal. Each of these crystal terminals is also connected directly to the gate of the first FET of a respective pair and via a coupling capacitor to the gate of the second FET of the opposite pair, the last-mentioned gate being biased with a potential outside the voltage range of the supply battery. In an integrated module, the reference terminal may be a heteropolar enclave of a substrate capacitively separated from actual ground, the biasing potentials for the gates of the several FETs in the energizing circuit being derived from an ancillary network which lies between the reference pole and ground and which includes ancillary FETs shunting the inter-gate coupling capacitors.
REFERENCES:
patent: 3585527 (1971-06-01), Luscher
patent: 3829795 (1974-08-01), Minney
patent: 3890580 (1975-06-01), Kuhn et al.
Battelle (Memorial Institute)
Dubno Herbert
Grimm Siegfried H.
Ross Karl F.
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