U2791B
| Model | U2791B |
| Description | 1000 MHz Quadrature Demodulator |
| PDF file | Total 11 pages (File size: 259K) |
| Chip Manufacturer | TEMIC |
U2791B
Electrical Characteristics
TELEFUNKEN Semiconductors
Test conditions (unless otherwise specified); V
S
= 5 V, T
amb
= 25°C, referred to test circuit
System impedance Z
O
= 50
W
, fiLO = 950 MHz, PiLO = –10 dBm
Parameters
I/O outputs
Test Conditions / Pins
Emitter follower
I = 0.6 mA
Note 5
Pins 1, 2, 19 and 20
Symbol
I, IX / Q,
QX
BWI/Q
AII/Q
QEI/Q
Max I/Q
VOUT
VOFSI/Q
I/IX
Q/QX
Zout
Min.
Typ.
Max.
Unit
3-dB bandwidth
w/o external C
I/Q amplitude
Pins 1, 2, 19 and 20
imbalance
I/Q quadrature error
Pins 1, 2, 19 and 20
I/Q maximum output
Pins 1, 2, 19 and 20
swing
Symm. output R
L
> 5 k
W
DC output voltage
Pins 1, 2, 19 and 20
DC output offset voltage Note 6 Pins 1, 2, 19 and 20
≥
30
≤ ±0.2
≤ ±1.5
2
2.8
≤
30
MHz
dB
Deg
V
PP
V
mV
Output impedance
Gain control, GC
Control range power
gain, gain high/gain low
Switch voltage
“Gain high”
“Gain low”
Settling time, ST
Power “OFF ” – “ON ”
Power “ON ” – “OFF ”
Pins 1, 2, 19 and 20
see figure 6
Note 7
Pin 11
50
W
GCR
PGH/GGL
GCVHigh
GCVLow
STON
STOFF
25
23/–2
1
dB
Note 8
Pin 11
Pin 11
V
V
s
m
s
m
<4
<4
Note 5: Due to test board parasitics this bandwidth is reduced and not equal for I, IX, Q, QX.
If symmetry and full bandwidth is required the low-pass Pins 3, 4, 9 and 10 should be isolated from the board.
The bandwidth of the I/Q outputs can be increased further by using a resistor between the Pins 3, 4, 9 and 10.
This resistors shunt the internal loads of RI 5.4 k
W
The decrease in gain here has to be considered.
Note 6: Output emitter follower internal acurrent I = 0.6 mA allows only small voltage swing with a 50
W
load.
For low signal distortion the load impedance should be RI
≥
5 k
W
.
Note 7: Referred to the level of the output vector I
2
Q
2
.
Note 8: The low gain status is achieved with an open or high ohmic Pin 11. A recommended application circuit for
switching between high and low gain status is shown in figure 1.
)
4 (11)
Rev. A2: 08.06.1995
