U2791B Datasheet, PDF (10/11 Pages) TEMIC Semiconductors – 1000 MHz Quadrature Demodulator

U2791B
TELEFUNKEN Semiconductors
Description of Evaluation Board
Board material:
Ã¥ epoxy; r = 4.8, thickness = 0.5 mm
W transmission lines: Z_O = 50
The board offers the following functions
D The test circuit for the U2791B:
– The supply voltage and the control inputs GC, PC and
PD are connected via a plug strip. The control input
voltages can be generated via external
potentio-meters; then the inputs should be
ac-grounded (time requirements in burst-mode for
power up have to be considered).
– The outputs I, IX, Q, QX are dc coupled via an plug
strip or can be ac-connected 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.
– Also the offsets of both channels can be adjusted with
two potis or resistors.
– The LO- and the RF-inputs are ac-coupled and
connected via SMB plugs. If transmission line T3 is
connected to the RF-input and ac-grounded at the
W other end, gain and noise performance can be
improved (input matching to 50 ).
– The complementary RF-input is ac-coupled to GND
(CRFX = 1 nF).
D A calibration part, which allows to calibrate an
s-parameter analyzer directly to the in- and output-
signal ports of the U2791B.
D For single ended measurements at the demodulator
outputs, two OP’s (e.g., AD620 or other) can be
configured with programmable gain; together with an
W W output-divider network RD = 450 to RL = 50 ,
W direct measurements with 50 load-impedances are
t possible at frequencies 100 kHz.
Ordering Information
Extended Type Number
U2791B-FS
Package
SS0 20
Remarks
Dimensions in mm
Package: SSO 20
10 (11)
94 8872
Rev. A2: 08.06.1995