A CMOS 0.8µ m Transistor-Only 10.5bit@1.63MHz@10kHz Switched-Current Fourth-Order Bandpass Modulator

Figure 1: Die microphotograph

Figure 2: Block diagram and Schematics

a) Block diagram

b) Schematic of the Switched-Current LDI Integrator

c) Schematic of the Current Mode Buffer

Figure 3: Photograph of the chip and package pin diagram.

Figure 4: Photograph and schematic of the PCB for the characterization of the modulator.

Figure 5: Measured Output Spectrum for a -9dB@2.5MHz single tone input signal and 10MHz clock frequency.

Figure 6: Measured SNR vs. input level for a sinusoidal input signal with AM IF frequency and BW=10kHz.

Figure 7: Measured performance of the modulator