Input Stages for Radio Systems (Low Noise Amplifiers) (LNAs)

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Presentation transcript:

Input Stages for Radio Systems (Low Noise Amplifiers) (LNAs)

Requirements: Signal transfer from the incoming electromagnetic wave with maximum efficiency, Minimum interactions of different incoming signals in the amplifier, - Minimum noise, generated in the amplifier.

Maximum signal transfer from antenna to the LNA

Example: PIFA (printed inverted-F antenna) (Z. Feng et al.) Frequency for which the impedance is 50 ohm (real): f(50 ohm) = 2440 MHz

Derived equivalent circuit Rp=210 ohm Cp=3.96 pF Lp=1.27 nH Ls=6.39 nH

(A) High impedance load (B) 210 ohm resistive load (C) 50 ohm resistive load (For 1 mA drive current )

Suitable circuits as antenna amplifier a) Common gate amplifier Low input impedance. High output impedance. Suitable for tuned load. Suitable for wide-band applications with a resistive load.

b) Trans-impedance amplifier with parallel current feedback: Low input impedance. Low output impedance. Not suitable for tuned load. Suitable for wide-band applications with a resistive load.

c) Amplifier with inductive source degeneration: Low input impedance for a certain frequency. High output impedance. Suitable for tuned load. Not suitable for wide-band applications.

d) Current mirror input amplifier Low input impedance. High output impedance. Suitable for tuned load. Suitable for wide-band applications with a resistive load.

The input matching (Input impedance of a inductive source degenerated transistor)

The physical source of the nonlinearity :