Analysis of Input/Output Transfer Characteristic to Transmit Modulated Signals through a Dynamic Frequency Divider

Title & Authors
Analysis of Input/Output Transfer Characteristic to Transmit Modulated Signals through a Dynamic Frequency Divider
Ryu, Sungheon; Park, Youngcheol;

Abstract
In order to transmit baseband signals through frequency dividing devices, we studied the transfer function of the device in the term of the baseband signal distortion. From the analysis, it is shown that the magnitude of the envelope signal is related to the mixer gain and the insertion loss of the low pass filter whilst the phase is the additional function with the 1/2 of the phase delay. For the purpose of the verification of the study, we designed a dynamic frequency divider at 1,400 MHz. The operating frequency range of the device is closely related to the conversion gain of mixers and the amplitude of input signal, and becomes wide as the conversion gain of mixers increases. The designed frequency divider operates between 0.9 GHz and 3.2 GHz, for -14.5 dBm input power. The circuit shows 20 mW power dissipation at $\small{V_{DD}=2.5V}$, and the simulation result shows that an amplitude modulated signal at 1,400 MHz with the modulation index of 0.9 was successfully downconverted to 700 MHz.
Keywords
CMOS;Miller Frequency Divider;Dynamic Frequency Divider;
Language
Korean
Cited by
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