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Low-voltage Darlington amplifier

An amplifier and low-voltage technology, applied in the field of low-voltage Darlington amplifiers, can solve the problems of deteriorating noise figure, deteriorating input voltage standing wave coefficient, and high terminal voltage of Darlington amplifier devices, and achieving the effect of avoiding noise figure

Active Publication Date: 2014-10-22
NO 24 RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional Darlington amplifier, this solution only eliminates the voltage drop on the bias resistor, but the device terminal voltage of the device Darlington amplifier itself does not change, so it cannot solve the problem of the high device terminal voltage of the Darlington amplifier. The problem, and because the self-bias part is connected to the circuit signal input terminal, it will cause a series of problems such as deteriorating the noise figure and deteriorating the standing wave coefficient of the input voltage.

Method used

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Embodiment Construction

[0020] The circuit diagram of the low-voltage Darlington amplifier embodied by the present invention is as figure 2 shown. It includes a basic Darlington amplifying unit, an AC-DC separation unit and a power supply voltage polarity conversion unit. Its specific structure, connection relationship, and functional relationship are the same as the content of the invention in this specification, and will not be repeated here.

[0021] The operating principle of the circuit of the present invention is as follows:

[0022] RF signal through V IN After the port enters the Darlington amplifier, through the transistor Q 1b and transistor Q 2b After the signal is amplified by the composite Darlington tube composed of V OUT port output. Resistance R 1b and resistor R 2b Determine the transistor Q 1b Base operating point, and play an important role in the gain, bandwidth, input impedance and noise of the Darlington amplifier, the resistance R 4b is the transistor Q 1b The emitt...

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Abstract

The invention discloses a low-voltage Darlington amplifier which comprises a basic Darlington amplifying unit, an alternating-current and direct-current separating unit and a power voltage polarity conversion unit. Alternating current and direct current of the basic Darlington amplifying unit are separated and an alternating current ground is clamped in place. A direct current reference ground of the Darlington amplifier is clamped to a negative reference level, thus potential difference from the power voltage to the direct current reference ground is improved. The power voltage of the conventional Darlington amplifier is higher than 5-7V generally, but the power voltage of the low-voltage Darlington amplifier is 3-4V. The low-voltage Darlington amplifier is widely applied to various Darlington structural circuits of microwave monolithic integrated circuits IC.

Description

technical field [0001] The invention relates to a Darlington amplifier, in particular to a low-voltage Darlington amplifier, which is directly applied to the field of various Darlington circuits in microwave monolithic ICs. Background technique [0002] The amplifier is a key unit in the RF signal processing system, and its performance directly determines the performance of the RF signal processing system. Darlington amplifiers have been widely used because of their wide operating frequency band, high linearity, and easy cascading. [0003] When the Darlington amplifier is working, it needs an external bias current, which is generally realized by a voltage source and an external bias resistor. The larger the voltage drop across the bias resistor, the more stable the Darlington amplifier's bias current is over temperature and voltage variations. In order to obtain a stable bias, a voltage drop of at least 1-2V is generally required across the bias resistor. In order to obt...

Claims

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Application Information

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IPC IPC(8): H03F3/345
Inventor 刘成鹏王国强何峥嵘邹伟蒲颜
Owner NO 24 RES INST OF CETC
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