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LMV710 bảng dữ liệu(PDF) 14 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LMV710
Giải thích chi tiết về linh kiện  Low Power, RRIO Operational Amplifiers with High Output Current Drive and Shutdown Option
PDF  19 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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LMV710 bảng dữ liệu(HTML) 14 Page - National Semiconductor (TI)

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Application Note (Continued)
GSM POWER AMPLIFIER CONTROL LOOP
There are four critical sections in the GSM Power Amplifier
Control Loop. The class-C R
F power amplifier provides am-
plification of the R
F signal. A directional coupler couples
small amount of R
F energy from the output of the RF P. A. to
an envelope detector diode. The detector diode senses the
signal level and rectifies it to a DC level to indicate the signal
strength at the antenna. An op-amp is used as an error
amplifier to process the diode voltage and ramping voltage.
This loop control the power amplifier gain via the op-amp
and forces the detector diode voltage and ramping voltage to
be equal. Power control is accomplished by changing the
ramping voltage.
The LMV710, LMV711 and LMV715 are well suited as an
error amplifier in this application. The LMV711 and LMV715
have an extra shutdown pin to switch the op-amp to shut-
down mode. In shutdown mode, the LMV711 and LMV715
consume very low current. The LMV711 provides a ground
voltage to the power amplifier control pin V
PC. Therefore, the
power amplifier can be turned off to save battery life. The
LMV715 output will be “tri-stated” when in shutdown.
10132506
FIGURE 9. Typical of GSM P.A. Control Loop
www.national.com
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