Amplifiers – With semiconductor amplifying device – Including field effect transistor
Patent
1990-03-02
1991-06-18
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including field effect transistor
330311, 330296, H03F 316
Patent
active
050252267
ABSTRACT:
A high-gain, low noise solid-state multiple stage amplifier (12) includes a phase-inverting input stage (20) and a phase non-inverting output stage (30). The input stage includes a first transistor (Q.sub.1) having a current-dependent transconductance value. The first transistor is operatively connected to a load resistor (R.sub.L1) through which a load current (I.sub.1) flows. An amplified phase-inverted version of a time-varying signal applied to the input (V.sub.i) is developed across the load resistor. The value of the load resistor together with the transconductance value affects the voltage gain of the input stage. A resistor (R.sub.2) provides a supplemental bias current (I.sub.2) to a current summing node (A). The current summing node sums the load current and the supplemental bias current and provides the first transistor with a total current (I.sub.d) that affects the transconductance value. The value of the supplemental bias current is chosen to supplement the load current to provide a predetermined total current so that the voltage gain may be selected by adjusting the load resistor without changing the transconductance value. The output stage includes a second transistor (Q.sub.6) having an input terminal that receives at the output (V.sub.0 ') of the input stage the amplified phase-inverted version of the input signal. The output stage amplifies but does not further phase-invert the input signal. The input and output stage cooperate to provide the amplifier with high overall gain and wide bandwidth properties.
REFERENCES:
patent: 4658220 (1987-04-01), Heston et al.
Angello Paul S.
Meza Peter J.
Mottola Steven
Triquint Semiconductor, Inc.
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