A high-speed broadband frequency-voltage conversion circuit

Abstract

The invention provides a high-speed wide-band frequency-voltage conversion circuit. Rising edge detection is performed twice for input signals and the conversion of the states of two switches is controlled, so that when the two switches are turned on together, the time used by a bias current source for charging a capacitor is only one cycle of input signals, and thus rapid conversion from frequency signals to voltage signals of the circuit is achieved, output establishing time is reduced and the working efficiency and the response speed of a whole circuit system are increased. While the circuit structure is simplified, the input signal processing speed of the circuit is increased and power consumption is reduced; resistors are not used and only one capacitor is used, so that external application of control signals is not needed, the stray capacitance effect and thermal noise influence caused by temperature change are effectively reduced, the layout area is reduced, the circuit is compatible with the standard CMOS technology and the production cost is reduced. The frequency-voltage conversion of the circuit only costs one input signal cycle, so that output establishing time is reduced and the working efficiency and the response speed of the whole circuit system are increased.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a high-speed broadband frequency-voltage conversion circuit. Background technique [0002] With the rapid development of wireless communication systems, a large number of radio frequencies are occupied, making it an urgent need to develop intelligent reconfigurable systems and electromagnetic wave frequency detection circuits. For the front-end system, the frequency detection circuit is a key module, which must quickly identify radio frequencies in complex and harsh environments, and allocate unoccupied frequency bands for devices. Frequency detection circuits are often used in frequency locked loops, self-tuning reconfigurable receivers, etc. In such circuits, the output settling time must be very short to be suitable for high-speed communication equipment. [0003] Most of the traditional frequency-to-voltage conversion circuits are based on the method of charge pu...

AI Technical Summary

Problems solved by technology

However, this method and circuit structure require several cycles before the output voltage reaches a stable value, and the output settling time is long, which limits the performance of subsequent circuit modules such as the frequency locked loop, and the parasitic capacitance of the control switch is large. Narrow frequency range, high circuit power consumption, low accuracy and sensitivity, occupying too much chip area, susceptible to interference from temperature, noise and external factors, reducing the performance index of the overall circuit system

Images