Transconductance circuit with adjustable corner frequency

Abstract

The invention discloses a transconductance circuit adjustable in corner frequency. The transconductance circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C1, a triode T1 and a triode T2, the resistor R2 is connected between an output end and a grounding end of the resistor R1, the output end of the resistor R1 is further connected with a non-inverting input end of a comparator A, the resistor R3 is connected between an inverting input end and a grounding end of the comparator A, an output end of the comparator A is connected with the resistor R6, a base of the triode T1 and the capacitor C1 simultaneously, the resistor R7 and the resistor R8 are sequentially connected with the resistor R6 serially, one end of the resistor R8 is further connected with a collector of the triode T1, a base of the triode T2 is connected with an emitter of the triode T1, an emitter of the triode T2 is connected with the resistor R4 and the resistor R5, and a collector of the triode T2 is connected with the collector of the triode T1. By the above principle, adjusting of corner frequency is realized, and selective filtering can be realized better.

Description

technical field [0001] The invention relates to the field of filters, in particular to a transconductance circuit with adjustable corner frequency. Background technique [0002] In recent years, my country has successfully developed a point-to-multipoint microwave communication system. Its central station uses an omnidirectional antenna to transmit around. Within 50 kilometers around, there can be multiple points to place user stations. From the user station, multiple telephone lines can be connected separately. to each user. Its overall capacity has different capacities such as 100 lines, 500 lines and 1000 lines. Each user station can be allocated to a dozen or dozens of telephone users, and it can also be extended to users hundreds of kilometers away through relay stations when necessary. . This point-to-multipoint microwave communication system is also very suitable for users in the suburbs of cities, from county towns to rural villages and towns or coastal islands, and...

AI Technical Summary

Problems solved by technology

There is no electric adjustment of the corner frequency in the existing filter, which brings inconvenience to the use

Images