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RFIC_Lecture_Note_No11_p192-p201 _Wideband Amps and Tunedà

RFIC_Lecture_Note_No11_p192-p201 _Wideband Amps and Tunedà

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ECE695F RFIC Prof. S. Mohammadi - - 192 Wide Bandwidth Amplifier Design Æ Read chapter 8 Shunt-peaked Amps Æ Goal : extend BW >> >> DD V R L C generate a zero in transfer function that can do gain peaking typically the input capacitance of the next stage (another MOS transistor) -3 dB with shunt peaking without shunt peaking bandwidth increases with this method R L since you use a series combination of inductor and resistor, you can use integrated inductors (Spiral) available on the chip without being worried about their Q >> >> assumption ignore transistor s parasitic (just a current source) R L C out V R L RC m define = time constant for capacitor time constant for inductor
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ECE695F RFIC Prof. S. Mohammadi - - 193 now by choosing m value you can get different results maximum bandwidth ~ 1.85 BW original 2 * = m without shunt peaking (problem ~20% peaking in frequency response) 20% 1.85 * BW ~ 1.8 BW original 2 * = m still very good peaking ~ 3% BW ~ 1.72 BW original 2 1 * + = m no peaking in gain will be seen maximally flat still gives phase distortion which might be important for some cases (input amplifier of oscilloscope) BW = 1.6 BW original 1 . 3 * = m no peaking no phase distortion (best group delay constant)
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ECE695F RFIC Prof. S. Mohammadi - - 194 Shunt-series Amplifier Æ goal : convenient input/output matching >> >> 1 R L R out in F R S R out R shunt feedback (typically high
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