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BiCMOS logarithmic amplifier

A logarithmic amplifier and current technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, transmission monitoring, etc., can solve the problems of large load resistance, large chip area, large resistance, etc., to save chip area, The effect of large chip area and good linearity

Inactive Publication Date: 2006-02-01
EAST CHINA NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

At the same time, the linearity of the CMOS limiting detection unit is not high
The power consumption of the bipolar limiter detection unit is relatively high. Compared with the CMOS limiter detection unit, a large number of resistors are required, and the size of the load resistor is relatively large, which occupies a large chip area and increases the cost. At the same time, the accuracy of the load resistor is not good. High, it will directly affect the stability of the gain of the limiting amplifier, and then affect the dynamic range of the RSSI output of the logarithmic amplifier

Method used

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Embodiment Construction

[0016] The technical solution of the present invention is a specific embodiment, and no additional embodiment will be added here. The working principle of the technical solution of the present invention will be described in detail below. As mentioned above, the logarithmic amplifier of the present invention includes a cascaded circuit of five BiCMOS single-stage limiter detection units, and uses the superposition of the limiter curves of each stage to complete the approximation to the logarithmic curve. Now take the first single-stage limiter detection unit 51 , that is, the BiCMOS single-stage limiter detection unit as an example to illustrate. Suppose the positive input signal applied to the base of the first transistor Q1 is V i n + = V ic + V id 2 ,...

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Abstract

Belonging to technical area of IC circuit design and signal process, being structure same as to CMOS or Bipolar logarithmic amplifier, the amplifier possesses circuit is composed of feed back circuit of DC level, single end-difference conversion circuit, current adder circuit, current-voltage conversion circuit, and cascaded module of five pieces of single staged clipping detection unit. Characters are that the said single staged clipping detection unit is combined from Bipolar circuit and CMOS circuit. Features are simple structure, good linearity, low power consumption, less area used by chip, and adjustable RSSI dynamic range.

Description

technical field [0001] The invention relates to a BiCMOS logarithmic amplifier, which belongs to the technical field of integrated circuit design and signal processing. Background technique [0002] With the rapid development of microelectronics technology and communication technology, people's demand for wireless products is also increasing. Especially in some high-performance receivers, a logarithmic amplifier is required to suppress a wide range of intermediate frequency signals, and generate a square wave containing the phase and frequency information of the input signal for processing by the next-level circuit. A logarithmic amplifier is an integral part of a signal demodulation circuit. At the same time, the logarithmic amplifier also completes the received signal strength indicator (RSSI) function. The measurement of the input signal strength is accomplished by using the characteristic that the output voltage of the RSSI terminal of the logar...

Claims

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Application Information

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IPC IPC(8): H03F3/00H04B17/00
Inventor 许永生陶永刚赖宗声石春琦金玮俞惠洪亮李勇
Owner EAST CHINA NORMAL UNIVERSITY
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