【摘 要】
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This paper presents a wideband variable gain amplifier (VGA) featuring a decibel-linear gain control characteristic.The decibel-linear gain control function is realized using two VGA cells and a control signal converter.The bandwidth is extended by using
【机 构】
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The 54th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang 050081,
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This paper presents a wideband variable gain amplifier (VGA) featuring a decibel-linear gain control characteristic.The decibel-linear gain control function is realized using two VGA cells and a control signal converter.The bandwidth is extended by using cascode architecture together with active inductive load.To achieve small parasitic and low area,direct current (DC) coupling is adopted in the circuit while a DC offset cancellation (DCOC) circuit is introduced to cancel the DC offset.Fabricated in a 0.18 μm complementary metal oxide semiconductor (CMOS) process,the chip occupies an area of 0.53 mm × 0.48 mm (including pads) and draws a total current of 9 mA from a 1.8 V supply.The measurement results show that the gain of the VGA varies from -40 dB to 18 dB while the control voltage varies from 0 to 1.8 V,resulting in a total gain control range of 58 dB.The 3 dB bandwidth of the VGA is larger than 260 MHz at maximum gain.
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