Variable gain amplifier
A detailed study of various variable gain topologies is presented in this report. A Variable Gain Amplifier (VGA) with an exponential gain control characteristic is desired in Automatic Gain Control (AGC) application. Thus, a metal-oxidesemiconductor (MOS) variable gain amplifier with linear in dB c...
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| Format: | Theses and Dissertations |
| Published: |
2008
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| Online Access: | http://hdl.handle.net/10356/4375 |
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| Institution: | Nanyang Technological University |
| Summary: | A detailed study of various variable gain topologies is presented in this report. A Variable Gain Amplifier (VGA) with an exponential gain control characteristic is desired in Automatic Gain Control (AGC) application. Thus, a metal-oxidesemiconductor (MOS) variable gain amplifier with linear in dB characteristic was designed. The voltage gain or transconductor of the VGA can be varying by a control voltage. This amplifier, based on complementary MOS (CMOS) transistors operating in strong inversion, is composed of exponential voltage generator block, four quadrant analog multiplier and tranresistance output stage. |
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