Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-03-21
1999-04-20
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330259, 330295, 330300, 330296, H03F 345, H03F 368
Patent
active
058960627
ABSTRACT:
In an amplifier circuit, bias feedback to an amplifying transistor is provided by interconnecting the DC bias voltage applied to the transistor output and the transistor input with a feedback circuit consisting of a switching transistor and bias resistors. Bias current and stable operation is provided by this design. In a particular embodiment two common emitter amplifying transistors are connected to a common output and each has a separate bias feedback circuit including a respective switching transistor. A single DC control input connected to the inputs of both switching transistors can be used to switch between the two amplifying transistors depending on the value of the control voltage thereby amplifying either an input signal of the first amplifying transistor or an input signal of the second amplifying transistor.
REFERENCES:
patent: 5451907 (1995-09-01), Keane et al.
patent: 5578963 (1996-11-01), Andersen
"Low-Current RFIC Downconverter", pp. 1-14, (1994).
Mohindra, "Isolator For DECT Open Loop Modulation", RF Synthesizers, pp. 30-42, (1996).
Roy Stephen G.
Tiller Samuel A.
Mottola Steven
Northern Telecom Limited
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