Demystifying Switched Capacitor Circuits

Design of SC Delta-Sigma Modulators for Multistandard RF Receivers

301

8.5 Measurement Results

The ∆Σ modulators described in this chapter have been incorporated into a multi-

standard RF transceiver chip, which is fabricated in a 0.35-mm, DP5M 2.5-V CMOS

process. The chip microphotograph of the ∆Σ modulators and decimation fi lter is

shown in Figure 8.23. The total active silicon area is about 16 mm

2

, and the modula-

tor takes up 0.50 mm

2

. During the measurement, the acquired output data stream is

stored in a fi le and then loaded into the computer for additional postfi ltering and

spectral analysis.

Intermodulation measurement is performed for t