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參數(shù)資料
| 型號(hào)： | MAX2451 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 衰減器 |
| 英文描述： | 3V, Ultra-Low-Power Quadrature Demodulator |
| 中文描述： | RF/MICROWAVE I/Q MODEM |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大?。?/td> | 58K |
| 代理商： | MAX2451 |
_______________Detailed Desc ription
The following sections describe each of the functional
blocks shown in the Functional Diagram Also refer to
the Typical Application Block Diagram (Figure 1).
Demodulator
The demodulator contains a single-ended-to-differential
converter, two Gilbert-cell multipliers, and two fixed
gain stages. Internally, IF is terminated with a 400
resistor to GND. The IF input signal is AC coupled into
the input amplifier, which has 14dB of gain. This ampli-
fied IF signal is fed into the I and Q channel mixers for
demodulation. The multipliers mix the IF signal with the
quadrature LO signals, resulting in baseband I and Q
signals. The conversion gain of the multipliers is 15dB.
These signals are further amplified by 21dB by the
baseband amplifiers. The baseband amplifier chains
are DC coupled.
Loc al Osc illator
The local-oscillator section is formed by an emitter-cou-
pled differential pair. Figure 2 shows the local-oscillator
equivalent circuit schematic. An external LC resonant
tank determines the oscillation frequency, and the Q of
this resonant tank affects the oscillator phase noise.
The oscillation frequency is twice the IF frequency, for
easy generation of quadrature signals.
The oscillator may be overdriven by an external source.
The source should be AC coupled into TANK/TANK, and
should provide 200mVp-p levels. A choke (typically
2.2μH) is required between TANK and TANK. Differential
input impedance at TANK/TANK is 10k
. For single-
ended drive, connect an AC bypass capacitor (1000pF)
from TANK to GND, and AC couple TANK to the source.
The oscillator can be overdriven at frequencies up to
1GHz (500MHz IF), but conversion gain and prescaler
output levels will be somewhat reduced.
M
3V, Ultra-Low-Power
Quadrature Demodulator
4
_______________________________________________________________________________________
_____________________Pin Desc ription
NAME
FUNCTION
1
IF
IF Input
Ground
2, 3, 16
GND
PIN
4
N.C.
No Connect. No internal connec-
tion to this pin.
5
ENABLE
Enable Control, active high
6
PRE_OUT
Local-Oscillator Divide-by-8
Prescaled Output
7
LO_V
CC
Local-Oscillator Supply. Bypass
separately from V
CC
.
8
TANK
Local-Oscillator Resonant Tank
Input
9
TANK
Local-Oscillator Resonant Tank
Inverting Input
10
LO_GND
Local-Oscillator Ground
11
Q
Baseband Quadrature Inverting
Output
12
Q
Baseband Quadrature Output
13
I
Baseband Inphase Inverting
Output
14
15
I
Baseband Inphase Output
Demodulator Supply
V
CC
2
A/D
A/D
÷8
POST
PROCESSING
DOWNCONVERTER
MAX2451
2
90
0
Figure 1. Typical Application Block Diagram
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