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本帖最后由 shaweikang1984 于 2011-1-30 10:57 编辑
Abstract
A continuous-time fourth-order equiripple linear
phase filter with an automatic tuning circuit is presented.
A high speed OTA based on the inverter structure is realized. The
combined common-mode feedforward and common-mode feedback
circuit ensures the input and output common-mode stability.
The gain performance could be maintained by combining an
equivalent negative resistor circuit at the output nodes. Transconductance
tuning can be achieved by adjusting the bulk voltage
by using the deep-NWELL technology. The modified automatic
tuning circuit relaxes the speed requirement of the tuning blocks.
Through the use of the operational transconductance amplifier
as a building block with the automatic tuning scheme, the filter
3 dB cutoff frequency is 1 GHz with the group delay less than
4% variation up to 1.5 fc frequency. The 43 dB of IM3 at
filter cutoff frequency is obtained with 4 dbm two-tone signals.
Implemented in 0.18- m CMOS process, the chip occupies 1 mm􀀀
and consumes 175 mW at a 1.5-V supply voltage.
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发表于 2011-1-30 10:56:07
