Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Diverging with single input and plural outputs
Patent
1993-07-19
1996-03-05
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Diverging with single input and plural outputs
327427, 327431, H03K 17693
Patent
active
054971187
ABSTRACT:
The invention is intended to offer a signal selector circuit and a signal-generating circuit which are excellent in linearity between input and output signals at high frequencies and in isolation between input signals and isolation between output signals and which do not produce distortion. When an output signal is taken from OUT.sub.1, a circuit connected with the gate terminal of Q.sub.11 is made to have a high impedance, and a cutoff voltage deeper than the pinchoff voltage is applied to the gate of Q.sub.12. With respect to each of Q.sub.11, Q.sub.12, the gate is connected with the source by R.sub.11 or R.sub.12. Both Q.sub.11 and Q.sub.12 have depletion characteristics. The resistances of R.sub.11 and R.sub.12 are lower than the impedances of Q.sub.15 and Q.sub.16 when they drive the gates so as to turn on Q.sub.11 and Q.sub.12. In this case, therefore, the voltage between the gate and the source of Q.sub.11 is made null and Q.sub.11 conducts. Q.sub.12 is cut off. The voltage between the gate and the source is zero or maintained at a constant value irrespective of the state of the passing signal. Hence, self-modulation which would have been encountered in the prior art techniques can be prevented.
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Nakagawa Shigeru
Ueno Toshiaki
Callahan Timothy P.
Hewlett--Packard Company
Nu Ton My-Trang
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