Method and apparatus for achieving multiple acoustic charge tran

Details Method and apparatus for achieving multiple acoustic charge tran Method and apparatus for achieving multiple acoustic charge tran

1990-08-02

1991-12-17

James, Andrew J.

Boots, shoes, and leggings

357 26, 364827, 377 60, H01L 2978

Patent

active

050738070

ABSTRACT:
A bipolar injector structure, similar to a common-base amplifier circuit, is described for use as a unidirectional injector of charge for a charge-transfer device input circuit. This injector structure acts to reduce the input impedance of such devices. A plurality of bipolar injector structures may be implemented on a single ACT device channel, and electrically connected in parallel, to effect a further reduction of input impedance and a further increase in device dynamic range. By employing an input contact structure which allows charge to be injected at more than one point along the length of the channel, without perturbing charge which was injected at some earlier time, a means for forming a transversal filter function can be realized at the input contact structure in addition to that which is achieved at the output contact structure, thus permitting improved ACT device selectivity when operated as a filter. The plurality of bipolar injection structures form a transversal filter, allowing the overall ACT device to achieve out-of-band rejection and selectivity.

REFERENCES:
patent: 4085441 (1978-04-01), Fagan
patent: 4231810 (1980-11-01), Jantsch et al.
patent: 4369378 (1983-01-01), Rockett, Jr.
patent: 4633285 (1986-12-01), Hunsinger et al.
patent: 4799244 (1989-01-01), Mikoshiba et al.

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