Design of Analog CMOS Integrated Circuits
Design of Analog CMOS Integrated Circuits
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This paper presents a new open-loop phase shifter and frequency synthesizer which can be implemented by small hardware. In the proposed method the differential square wave is converted to a differential ramp. Then the cross points of two ramps are detected as the middle points of high or low durations and are recovered to full digital levels, for 90° shifting operation. 4-phases in 50 MHz frequency can be generated by 3.5 mW power consumption and 60 μm × 60 μm area. All circuits have been simulated in 0.35 μm CMOS technology.