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Demystifying Switched Capacitor Circuits
book

Demystifying Switched Capacitor Circuits

by Mingliang (Michael) Liu
June 2006
Intermediate to advanced content levelIntermediate to advanced
336 pages
10h 24m
English
Newnes
Content preview from Demystifying Switched Capacitor Circuits
Design of SC Delta-Sigma Modulators for Multistandard RF Receivers
303
8.6 Conclusions
In this chapter, we studied the design of delta-sigma (∆Σ) modulators appropriate for
multistandard RF receptions. The ∆Σ modulators have been incorporated into a
multistandard (GSM/WCDMA/DECT) RF transceiver chip, which is fabricated in a
0.35-mm, DP5M 2.5-V CMOS technology. It has been demonstrated that the high-
frequency IF signal digitization can be performed by a pair of low-pass ∆Σ
modulators.
Figure 8.24 Measured output spectrum (WCDMA only).
Input: –4 dBFS, 100 kHz
(WCDMA)
0
–20
–40
–60
–80
Spectral Power (dB)
–100
–120
–140
0.4 0.8 1.2 1.6 2
Frequency (MHz)
Dem
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Publisher Resources

ISBN: 9780750679077