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Amplifier with improved input resistance and controlled common mode

A technology of input resistance and amplifier, applied to amplifiers with semiconductor devices/discharge tubes, improved amplifiers to reduce noise effects, amplifiers, etc., can solve problems affecting LNA gain, frequency selectivity and noise performance

Active Publication Date: 2012-11-14
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degradation of the input resistance loads the LNA and affects the gain, frequency selectivity and noise performance of the LNA

Method used

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  • Amplifier with improved input resistance and controlled common mode
  • Amplifier with improved input resistance and controlled common mode
  • Amplifier with improved input resistance and controlled common mode

Examples

Experimental program
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Embodiment Construction

[0020] figure 2 An environment 200 is illustrated, such as a wireless receiver. Environment 200 includes input circuitry 205 , amplifier 230 , mixer 235 , filter 240 , analog-to-digital converter (ADC) 245 , and digital block 250 . The input circuit 205 may include a low noise amplifier (LNA) 210 and a tuning circuit 215 . Tuning circuit 215 is coupled to the output of LNA 210 and includes an inductor 220 and a capacitor 225 coupled in parallel connection. Tuning circuit 215 provides voltage gain for in-band signals and rejects out-of-band signals. Amplifier 230 (eg, an RF amplifier) ​​is coupled between input circuit 205 and mixer 235 to prevent loading of input circuit 205 . Mixer 235 may be a multiplying mixer that multiplies the input from the oscillator clock and amplifier 230 to provide an output signal. The output signal from mixer 235 is further sent to filter 240 . Filter 240 may be an intermediate frequency filter that converts the output signal into an interme...

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PUM

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Abstract

An amplifier (230) includes a first pair of transistors (305A) that defines a first output (Vo-), each transistor (315A, 320a) of the first pair (305A) having a gate coupled to a first input terminal (330A); a second pair of transistors (305B) that defines a second output (Vo+), each transistor (315B, 320B) of the second pair (305B) having a gate coupled to a second input terminal (330b); a first capacitor (350A) coupled to the second output terminal (310B) and to the gate of a first transistor (315a) of the first pair; a second capacitor (355A) coupled to the second output terminal (310B) and to the gate of a second transistor (320A) of the first pair; a third capacitor (350B) coupled to the first output terminal (310A) and to the gate of a third transistor (315B) of the second pair; and a fourth capacitor (355B) coupled to the first output terminal (310A) and to the gate of a fourth transistor (320B) of the second pair.

Description

technical field [0001] Embodiments of the invention relate to a circuit including an amplifier, and to a method for controlling a common-mode voltage. Background technique [0002] A radio frequency (RF) amplifier is a device used to amplify RF signals in several applications, such as wireless receiver applications. An RF amplifier is coupled between the input circuit (eg, a low noise amplifier (LNA)) and the mixer to prevent the mixer from loading the LNA. [0003] Example RF amplifier 100 (hereinafter referred to as amplifier 100) in figure 1 (Prior Art). The outputs of the LNA (Vin+ and Vin-) are coupled to transistor 105, transistor 110, transistor 115 via capacitors (e.g., via capacitor 125 (Cac), capacitor 130 (Cac), capacitor 135 (Cac), and capacitor 140 (Cac), respectively. and the gate of transistor 120 . To prevent the amplifier 100 from loading the LNA and degrading the quality factor, the amplifier 100 requires a certain input resistance. Equation (1) descri...

Claims

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Application Information

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IPC IPC(8): H03F3/193H03F1/26
CPCH03F2203/45512H03F2200/168H03F3/45928H03F3/45475H03F3/45179H03F2200/411H03F3/45632
Inventor 拉卡什·库马尔吉里什·拉金德郎里图·塞奇德夫·辛格
Owner TEXAS INSTR INC