POLISH ACADEMY of SCIENCES
TECHNICAL SCIENCES
| BULLETIN
of the
POLISH ACADEMY of SCIENCES TECHNICAL SCIENCES |
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| Volume 52, Issue 2, July 2004 | ||||
| Issue Index | Authors Index | Scope Index | Web Info | |
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pp
141 - 148
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| Phase compensation scheme for feedforward linearized CMOS operational transconductance amplifier |
| S. SZCZEPANSKI and S. KOZIEL |
| In the paper, a feedforward linearization method for
differential-pair operational transconductance amplifier (OTA) is discussed. The proposed technique is developed using simple differential pair transconductors and linear reference resistor. The concept leads not only to very efficient linearization ofa transfer characteristic oft he OTA but also others the possibility of effffective phase compensation. Due to this, the circuit can be used in applications requiring precise phase response (e.g. filters). SPICE simulations show that for the circuit working with a ±1.25V power supply, total harmonic distortion (THD) at 0.8Vpp is less then 0.1% in comparison to 10.2% without linearization. Moreover, the input voltage range ofline ar operation is increased. Power consumption oft he overall circuit is 0.94mW. The 3rd order elliptic filter example has been designed and simulated. It turns out that the proposed compensation scheme significantly improves the performance of the filter at higher frequencies. |
| Keywords: |
| CMOS
transconductor, phase compensation, active-error feedforward
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| Copyright - Bulletin of the Polish Academy of Sciences: Technical Sciences
10 September 2004, site prepared by KZ |
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