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Adjustable grain low noise amplifier

An amplifier, low-gain technology, used in differential amplifiers, DC-coupled DC amplifiers, improving amplifiers to reduce the harmful effects of internal resistance, etc., can solve problems such as amplifier linearity deterioration

Inactive Publication Date: 2010-04-21
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adjusting the emitter adjustable resistor (1Re)40 will make the linearity of the amplifier worse

Method used

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  • Adjustable grain low noise amplifier

Examples

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Embodiment Construction

[0033] Please refer to Figure 3A , which is a block diagram of a high-linearity adjustable-gain low-noise amplifier of the present invention. The amplifier includes a gain control circuit (gain control circuit) 100 , a load circuit (load circuit) 110 , a current steering circuit (current steering circuit) 120 , and an input circuit (input circuit) 130 . The load circuit 110, the current guiding circuit 120, and the input circuit 130 are connected to form a cascode amplifier.

[0034] The gain adjustment control circuit 100 receives a gain adjusting voltage (VAGC), and then generates a resistance adjusting signal (Vp) and a current steering control signal (Vctrl). The load circuit 110 adjusts the resistance value of the variable resistor in the load circuit 110 according to the resistance value adjustment signal (Vp). The current steering circuit 120 is connected to the load circuit 110 by a plurality of current paths 115, which can receive the current steering control signa...

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Abstract

The invention discloses an adjustable grain low noise amplifier which is a cascode. The adjustable grain low noise amplifier comprises a grain adjusting control circuit, a load circuit, a current guiding circuit and an input circuit, wherein the grain adjusting control circuit is used for receiving a grain adjusting voltage and further generating a resistance value adjusting signal and a current guiding control signal; the load circuit comprises a plurality of variable resistors and is used for adjusting the resistance values of the plurality of the variable resistors according to the resistance values; the current guiding circuit is connected to the load circuit through a plurality of current paths and is used for adjusting the current ratios among the plurality of current paths according to the current guiding control signal and the current guiding circuit is provided with a differential signal output end; and the input circuit is connected to the current guiding circuit, wherein the input circuit is provided with a differential signal input end. The amplifier can provide low noise index during low grain and provide wider grain adjusting range, and further achieve lower power loss, smaller layout area, lower linearity requirement and other effects.

Description

technical field [0001] The invention relates to an adjustable gain low noise amplifier, especially a high linearity adjustable gain low noise amplifier, which can be used in TV tuners or other broadband communication systems, and can provide low noise at low gain. noise index. Background technique [0002] In a broadband communication system, such as a TV tuner, a high linear variable-gain low noise amplifier must be used and placed in a mixer )Before. In addition, general high linearity adjustable gain low noise amplifiers are generally implemented by using a current steering topology. [0003] Please refer to Figure 1A , which shows a well known high linearity adjustable gain amplifier. It was disclosed in "IEEE J. Solid-State Circuit" journal vol.26, no.11, pp.1673-1680 in 1991. The first transistor Q1 and the second transistor Q2 are connected to form a differential pair, wherein the bases of the first transistor Q1 and the second transistor Q2 are differential sign...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/08H03G1/04
Inventor 詹维嘉
Owner SUNPLUS TECH CO LTD
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