| Summary: | 碩士 === 國立中山大學 === 電機工程學系研究所 === 92 === Low voltage, low power amplifiers are proposed. One of the operational amplifiers is an Operational Transconductance Amplifier (OTA) with wide input and output swing and constant gm. The second and third amplifiers are high-performance Current Operational amplifiers (COAs). All amplifiers have power supply as low as one threshold voltage plus two overdrive voltage.
In this thesis, the supply voltage is 1V. Simulation results show that the OTA has the maximum linear range over 0.7V. The transconductance can be 147μA/V, the power consumption is 0.133mW. There are two designs of the COA. Simulation results show COA(1) with a current gain of 143. The input impedance is 110Ω, the output impedance is 240KΩ and the power consumption is 0.15mW. In the simulation results of the COA(2), the current gain is 110. The DC power dissipation is 0.07mW. The input and output impedance are 95Ω and 500KΩ, respectively.
All the proposed amplifiers are implemented on a TSMC 0.35μm 2p4m CMOS process technology and analyzed using HSPICE.
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