A switched-capacitor filter with dynamic switching bias OP amplifiers
| Autor: | Hiroo Wakaumi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Engineering
Frequency response business.industry Low-pass filter Amplifier 020208 electrical & electronic engineering 020207 software engineering 02 engineering and technology Switched capacitor law.invention Capacitor Duty cycle law Filter (video) 0202 electrical engineering electronic engineering information engineering Electronic engineering Operational amplifier business |
| Zdroj: | LASCAS |
| Popis: | A switched capacitor low-pass filter employing folded-cascode CMOS OP Amps with a dynamic switching bias circuit capable of processing video signals, which enables low power consumption, and operation in wide band-widths and low power supply voltages, is proposed. In this filter, charge transfer operations through two-phase clock pulses during the on-state period of the OP Amps and a non-charge transfer operation during their remaining off-state period are separated. Through simulations, it was shown that the low-pass filter with an OP Amp switching duty ratio of 50 % is able to operate at a 14.3 MHz high-speed dynamic switching rate, allowing processing video signals, and a dissipated power of 68 % of that observed in the static operation of the OP Amps and a full charge transfer operation without separation of a one cycle period. The gain below −33 dB in the frequency response, which is suitable, was obtained at over 6 MHz within a stopband. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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