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ADL5330 Datenblatt(PDF) 12 Page - Analog Devices

Teilenummer ADL5330
Bauteilbeschribung  VGA with Gain Control Range
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ADL5330
Data Sheet
Rev. B | Page 12 of 24
THEORY OF OPERATION
The ADL5330 is a high performance, voltage controlled variable
gain amplifier/attenuator for use in applications with frequencies
up to 3 GHz. This device serves as an output variable gain
amplifier (OVGA) for applications where a reasonably constant
input level is available and the output level adjusts over a wide
range. One aspect of an OVGA is the output metrics, OIP3 and
OP1dB, decrease with decreasing gain.
The signal path is fully differential throughout the device in
order to provide the usual benefits of differential signaling,
including reduced radiation, reduced parasitic feedthrough, and
reduced susceptibility to common-mode interference with other
circuits. Figure 31 provides a simplified schematic of the
ADL5330.
GAIN
CONTROL
OPHI
OPLO
INHI
INLO
TRANSIMPEDANCE
AMPLIFIER
Gm STAGE
Figure 31. Simplified Schematic
A controlled input impedance of 50 Ω is achieved through a
combination of passive and active (feedback-derived) termination
techniques in an input Gm stage. The input compression point
of the Gm stage is 1 dBm to 3 dBm, depending on the input
frequency.
Note that the inputs of the Gm stage are internally biased to a
dc level, and dc blocking capacitors are generally needed on the
inputs to avoid upsetting operation of the device.
The currents from the Gm stage are then injected into a balanced
ladder attenuator at a deliberately diffused location along the
ladder, wherein the location of the centroid of the injection
region is dependent on the applied gain control voltage. The
steering of the current injection into the ladder is accomplished
by proprietary means to achieve linear in dB gain control and
low distortion.
Linear in dB gain control is accomplished by the application of
a voltage in the range of 0 V dc to 1.4 V dc to the gain control
pin, with maximum gain occurring at the highest voltage.
The output of the ladder attenuator is passed into a fixed gain
transimpedance amplifier (TZA) to provide gain and buffer the
ladder terminating impedance from load variations. The TZA
uses feedback to improve linearity and to provide controlled
50 Ω differential output impedance. The quiescent current of
the output amplifier is adaptive; it is slaved to the gain control
voltage to conserve power at times when the gain (and output
power) are low.
The outputs of the ADL5330 require external dc bias to the
positive supply voltage. This bias is typically supplied through
external inductors. The outputs are best taken differentially to
avoid any common-mode noise that is present, but, if necessary,
can be taken single-ended from either output.
If only a single output is used, it is still necessary to provide bias
to the unused output pin, and it is advisable to arrange a reasonably
equivalent ac load on the unused output. Differential output can
be taken via a 1:1 balun into a 50 Ω environment. In virtually all
cases, it is necessary to use dc blocking in the output signal path.
At high gain settings, the noise floor is set by the input stage, in
which case the noise figure (NF) of the device is essentially
independent of the gain setting. Below a certain gain setting,
however, the input stage noise that reaches the output of the
attenuator falls below the input equivalent noise of the output
stage. In such a case, the output noise is dominated by the
output stage itself; therefore, the overall NF of the device gets
worse on a dB per dB basis, because the gain is reduced below
the critical value. Figure 9 through Figure 13 provide details of
this behavior.


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