Compensação em frequencia de amplificadores CMOS de dois e tres estagios

AUTOR(ES)

Andre Luis Fortunato

DATA DE PUBLICAÇÃO

2004

RESUMO

This dissertation analyzes the project techniques used in frequency compensation of CMOS operational amplifiers (op-amps). A collection of 10 op-amps, including two and three stages amplifiers was fabricated for test. Power consumption, unity gain frequency and stability were aimed for performance comparison. Poles movement analysis was extensively exploited in circuits understanding. Specially, for the two-stage amplifier, poles movement condition was obtained. Two distinct specifications were focused. For two stage amplifiers, specifications included nominal power supply of ±2V, an external load of 100kO in parallel with 50pF, a minimum open-loop gain of 60dB and a unity gain frequency of 1MHz. A more rigorous specification were aimed for three stage amplifiers: ±1,5V power supply, minimum DC gain of 100dB and 1MHz unity gain frequency driving an external load of 25 kO in parallel with 50 pF

ASSUNTO(S)

amplificadores eletronicos amplificadores operacionais curvas de frequencia

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