u2794b ATMEL Corporation, u2794b Datasheet - Page 13

• Manufacturer Part Number: u2794b
• Description: U2794b 1000-mhz Quadrature Demodulator
• Manufacturer: ATMEL Corporation

7. Description of the Evaluation Board
4653E–CELL–07/06
Board material: epoxy; r = 4.8, thickness = 0.5 mm, transmission lines: Z
The board offers the following functions:
• Test circuit for the U2794B:
• A calibration part which allows to calibrate an s-parameter analyzer directly to the in- and
• For single-ended measurements at the demodulator outputs, two OPs (e.g., AD620 or other)
output- signal ports of the U2794B.
can be configured with programmable gain; together with an output-divider network
RD = 450 to RL = 50 , direct measurements with 50 load impedances are possible at
frequencies t < 100 kHz.
– The supply voltage and the control inputs GC, PC and PU are connected via a plug
– The outputs I, IX, Q, QX are DC coupled via an plug strip or can be AC-connected
– The offsets of both channels can be adjusted with two potentiometers or resistors.
– The LO- and the RF-inputs are AC-coupled and connected via SMB plugs. If
– The complementary RF-input is AC-coupled to GND (CRFX = 1 nF), the same
strip. The control input voltages can be generated via external potentiometers; then
the inputs should be AC-grounded (time requirements in burst mode for power up
have to be considered).
via SMB plugs for high frequency tests e.g. noise figure or s-parameter
measurement. The Pins II, IIX, QQ, QQX allow user-definable filtering with 2
external capacitors CII, CQQ.
transmission line T3 is connected to the RF-input and AC-grounded at the other end,
gain and noise performance can be improved (input matching to 50 ).
appears to the complementary LO input (CNLO = 1 nF).
O
= 50
U2794B
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