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參數(shù)資料
| 型號： | AD831APZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 混頻器 |
| 英文描述： | RF/MICROWAVE DOUBLE BALANCED MIXER |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 550K |
| 代理商： | AD831APZ-REEL7 |
AD831
–6–
AD831
–7–
THEORY OF OPERATION
The AD831 consists of a mixer core, a limiting amplifier, a low
noise output amplifier, and a bias circuit (Figure 1).
The mixer’s RF input is converted into differential currents by
a highly linear, Class A voltage-to-current converter, formed by
transistors Q1, Q2 and resistors R1, R2.The resulting currents
drive the differential pairs Q3, Q4 and Q5, Q6.The LO input is
through a high gain, low noise limiting amplifier that converts the
–10 dBm LO input into a square wave.This square wave drives
the differential pairs Q3, Q4 and Q5, Q6 and produces a high
level output at IFP and IFN—consisting of the sum and differ-
ence frequencies of the RF and LO inputs—and a series of lower
level outputs caused by odd harmonics of the LO frequency mix-
ing with the RF input.
An on-chip network supplies the bias current to the RF and LO
inputs when these are ac-coupled; this network is disabled when
the AD831 is dc-coupled.
When the integral output amplifier is used, pins IFN and IFP
are connected directly to pins AFN and AFP; the on-chip load
resistors convert the output current into a voltage that drives
the output amplifier. The ratio of these load resistors to resistors
R1, R2 provides nominal unity gain (0 dB) from RF-to-IF. The
expression for the gain, in decibels, is
GdB =
20
4
1
2
10
log
p
(1)
where:
4
p
is the amplitude of the fundamental component of a
squarewave.
1
2
is the conversion loss.
p
2
is the small signal dc gain of the AD831 when the LO input
is driven fully positive or negative.
Figure 1. Simplified Schematic Diagram
REV. C
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