An MMIC Variable-Gain Amplifier Using a Cascode-Connected FET with Constant Phase Deviation
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概要
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An MMIC variable-gain amplifier, which improves the transmission phase deviation caused by gain control, is presented. At first, it is shown that by controlling both the common-gate FET's gate bias voltage and the common-source FET's gate bias voltage, the transmission phase deviation caused by gain control of the variable-gain amplifier using a cascode-connected FET is greatly improved. In this case it is not desirable to control both of the gate bias voltages independently, because of the complexity. Thus we propose two simple gate bias voltage control circuits controlling both of the gate bias voltages, in which only one of the two gate bias voltages is controlled independently and the other is controlled dependently. Then we apply these circuits to the 1.9-GHz-band variable-gain amplifier using the cascode-connected FET. One of the control circuits is the gate bias voltage control circuit using two resistors. It is confirmed that, by applying the newly proposed circuit, phase deviation is suppresscd, from between 0° and -30° to between +3° and -5°, with 25-dB gain control. The other circuit is the gate bias voltage control circuit using thc FET's nonlinear characteristics. It is confirmed that, by applying the newly proposed circuit, phase deviation is suppresscd, from between 0° and - 44° to between + 6° and -3°, with 30-dB gain control. This is a promising technique for reducing the transmission phase deviation caused by gain control of the amplifiers used in active phased array antennas.
- 社団法人電子情報通信学会の論文
- 1998-01-25
著者
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Muraguchi Masahiro
Ntt Wireless Systems Laboratories
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HAYASHI Hitoshi
NTT Wireless Systems Laboratories
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