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U2794B_08 Datasheet, PDF (1/15 Pages) ATMEL Corporation – 1000-MHz Quadrature Demodulator
Features
• Supply Voltage 5V
• Very Low Power Consumption 125 mW
• Very Good Image Rejection By Means of Phase Control Loop for Precise 90° Phase
Shifting
• Duty-cycle Regeneration for Single-ended LO Input Signal
• Low LO Input Level –10 dBm
• LO Frequency from 70 MHz to 1 GHz
• Power-down Mode
• 25 dB Gain Control
• Very Low I/Q Output DC Offset Voltage Typically < 5 mV
Benefits
• Low Current Consumption
• Easy to Implement
• Perfect Performance for Large Variety of Wireless Applications
1. Description
The silicon monolithic integrated circuit U2794B is a quadrature demodulator manu-
factured using Atmel®’s advanced UHF technology. This demodulator features a
frequency range from 70 MHz to 1000 MHz, low current consumption, selectable gain,
power-down mode, and adjustment-free handling. The IC is suitable for direct conver-
sion and image rejection applications in digital radio systems up to 1 GHz such as
cellular radios, cordless telephones, cable TV, and satellite TV systems.
Figure 1-1. Block Diagram
VS
PU
5,6 14
Power
down
IIX
II
43
IX
1
OUTPUT
2I
1000-MHz
Quadrature
Demodulator
U2794B
RFin 7
8
11
GC
90°Control
loop
16,18
GND
0°
90°
Frequency
doubler
10 9
QQX
QQ
Duty cycle 15 LO
regenerator 17
13 PC
12 PCX
Q
19
OUTPUT
20 QX
4653F–CELL–11/08