Power gain

Power gain

The power gain of an electrical network is the ratio of an output power to an input power. Unlike other signal gains, such as voltage and current gain, "power gain" may be ambiguous as the meaning of terms "input power" and "output power" is not always clear. Three important power gains are average power gain, transducer power gain and available power gain.

Average power gain

The average power gain of a two-port network, GP, is defined as:

:G_P = frac{P_{load{P_{input

where
*Pload is the average power delivered to the load
*Pinput is the average power entering the network

In terms of y-parameters this definition can be used to derive:

:G_P = frac{4|y_{21}|^2 Re{(Y_L)}Re{(Y_S){|(y_{11}+Y_S)(y_{22}+Y_L)-y_{12}y_{21}|^2}

where
*YL is the load admittance
*YS is the source admittance

This result can be generalized to z, h, g and y-parameters as:

:G_P = frac{4|k_{21}|^2 Re{(M_L)}Re{(M_S){|(k_{11}+M_S)(k_{22}+M_L)-k_{12}k_{21}|^2}

where
*kxx is a z, h, g or y-parameter
*ML is the load value in the corresponding parameter set
*MS is the source value in the corresponding parameter set

Transducer power gain

The transducer power gain of a two-port network, GT, is defined as:

G_T = frac{P_{load{P_{source,max

where
*Pload is the average power delivered to the load
*Psource,max is the maximum available average power at the source

Psource,max may only be obtained from the source when the load impedance connected to it (i.e. the equivalent input impedance of the two-port network) is the complex conjugate of the source impedance, a consequence of the maximum power theorem.

Available power gain

The available power gain of a two-port network, GA, is defined as:

G_A = frac{P_{load,max{P_{source,max

where
*Pload,max is the maximum available average power at the load
*Psource,max is the maximum available average power at the source

Similarly Pload,max may only obtained when the load impedance is the complex conjugate of the output impedance of the network.

References

* [http://rfic.eecs.berkeley.edu/~niknejad/ee142/pdf/lect4.pdf Lecture notes on two-port power gain]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • power gain — galios stiprinimas statusas T sritis automatika atitikmenys: angl. power amplification; power gain vok. Leistungsverstärkung, f rus. усиление мощности, n; усиление по мощности, n pranc. amplification de puissance, f; gain en puissance, m …   Automatikos terminų žodynas

  • power gain — galios stiprinimo koeficientas statusas T sritis automatika atitikmenys: angl. power amplification ratio; power gain vok. Leistungsverstärkungsfaktor, m rus. коэффициент усиления по мощности, m pranc. facteur d amplification en puissance, m; gain …   Automatikos terminų žodynas

  • Gain — For other uses, see Gain (disambiguation). In electronics, gain is a measure of the ability of a circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output. It is usually defined as the mean ratio of… …   Wikipedia

  • Power — (Roget s Thesaurus) < N PARAG:Power >N GRP: N 1 Sgm: N 1 power power Sgm: N 1 potency potency potentiality Sgm: N 1 jiva jiva Sgm: N 1 puissance puissance might force energy &c. 171 …   English dictionary for students

  • Power (physics) — In physics, power is the rate at which energy is transferred, used, or transformed. For example, the rate at which a light bulb transforms electrical energy into heat and light is measured in watts the more wattage, the more power, or what is the …   Wikipedia

  • gain en puissance — galios stiprinimas statusas T sritis automatika atitikmenys: angl. power amplification; power gain vok. Leistungsverstärkung, f rus. усиление мощности, n; усиление по мощности, n pranc. amplification de puissance, f; gain en puissance, m …   Automatikos terminų žodynas

  • gain en puissance — galios stiprinimo koeficientas statusas T sritis automatika atitikmenys: angl. power amplification ratio; power gain vok. Leistungsverstärkungsfaktor, m rus. коэффициент усиления по мощности, m pranc. facteur d amplification en puissance, m; gain …   Automatikos terminų žodynas

  • power amplification — galios stiprinimas statusas T sritis automatika atitikmenys: angl. power amplification; power gain vok. Leistungsverstärkung, f rus. усиление мощности, n; усиление по мощности, n pranc. amplification de puissance, f; gain en puissance, m …   Automatikos terminų žodynas

  • power amplification ratio — galios stiprinimo koeficientas statusas T sritis automatika atitikmenys: angl. power amplification ratio; power gain vok. Leistungsverstärkungsfaktor, m rus. коэффициент усиления по мощности, m pranc. facteur d amplification en puissance, m; gain …   Automatikos terminų žodynas

  • Gain (lasers) — Gain (or amplification) in laser physics is a process, where the medium transfers part of its energy to the emitted electromagnetic radiation, resulting in an increase in laser power. This is basic principle of all lasers.Quantitatively, the… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”