Design of the Dynamic Supply CMOS RF Power Amplifie - Linear CMOS RF Power Amplifiers for Wireless Applications - page 34

Fig. 3.18 Dynamic supply waveforms

Fig. 3.19 Simulated RF power amplifier impedance

frequency must be added to the phase of the LC filter. At 33 MHz, | φ td |= 56° added

to 180° and, hence, the switching frequency is deter-

mined. A summary of the simulated filter characteristics is presented in Table 3.2 .
Using an envelope analysis in ADS, the circuit of Fig. 3.17 was simulated with a
2-tone excitation—500 kHz tone spacing and 5.2 GHz center frequency. However,

| φ LC |= 124° equals | φ total |=