Amplifiers – Having light-controlled or activated device
Patent
1990-06-27
1991-06-25
Grimm, Siegfried H.
Amplifiers
Having light-controlled or activated device
250214A, 330277, 330308, 455619, H04B 1006, H03F 308, H03F 3193
Patent
active
050270800
ABSTRACT:
In analog communication, a transmission signal must be demodulated with good linearity. However, linearity of a reception signal is often impaired due to a too large input signal or variations during the manufacture of elements or a fluctuation in power supply voltage. According to this invention, a plurality of source-follower circuits constituting a demodulation circuit are formed on a single semiconductor substrate, a resistor having a high resistance is connected between the gate and the source of a first FET, and another resistor is connected to the source. The gate of each of the second and subsequent FETs is connected to the source of the immediately preceding FET, and its source is connected to the gate of the next FET. A product of a gate width of each of the second and subsequent FETs and a resistance of the resistor connected to the source is set to be equal to that of the first FET. An operation gate voltage of each FET is set to fall within a range wherein the relationship between the operation gate voltage and a drain current linearly changes. Since the FETs are formed on the single substrate, rates of variations during the manufacture of the elements and a fluctuation in power supply voltage become equal to each other. Therefore, according to this invention, a reception signal can be demodulated with excellent linearity.
REFERENCES:
patent: 4688267 (1987-08-01), Chown et al.
patent: 4750217 (1988-06-01), Smith et al.
Van Tuyl, "A Monolithic Integrated 4-GHz Amplifier", 1978, IEEE International Solid-State Circuits Conference, San Francisco, Calif., Feb. 15-17, 1978.
Grimm Siegfried H.
Sumitomo Electric Industries Ltd.
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