U2793B_06 Datasheet, PDF (11/13 Pages) ATMEL Corporation – 300-MHz Quadrature Modulator

U2793B
9. Application Circuits
Bias network for AC-coupled baseband inputs (V_BA, V_BB).
R₁ = 2.5 kΩ, R₂ ≤10 kΩ for ≥ 35 dB LO suppression which is in reference to < 2 mV input offset.
Figure 9-1. Application Circuit with AC-coupled Baseband Inputs
R₂
10
R₁
1n
V_{Ref PU}
Power down
13
1 _{6,7 VS}
100n
BB_{Ai 9}
Power
up
8 ^SPU
BB_Ai
19 _LP2
LO_i 14
Duty cycle
LO_i 15 _regenerator
Frequency
doubler
0°
90°
90° control
loop
Σ
LP1
20
4 RF_o
AC_GND
BB_Bi 11
BB_Bi ¹²
3,16,17,18
GND
2
5 _ACGND
Figure 9-2. Application Circuit with DC-coupled Baseband Inputs
100n
10k
10
BB_{Ai 9}
Baseband
processing
10k ^BBAi
100p
LO
LO_i 14
LO_i 15
Duty cycle
regenerator
10k
100n
10k
BB_BI ¹¹
BB_BI 12
Frequency
doubler
0°
90°
V_Ref
1n
PU
13
1
Power
up
Power down
6,7 ^VS
8 ^SPU
100n
90° control
loop
Σ
3,16,17,18
GND
19 _LP2 1n
LP1
20
OUT
4 RF_{o 1n}
AC_GND
1n
2
1n
5
AC_GND
10. Ordering Information
Extended Type Number
U2793B-NFSH
U2793B-NFSG3H
Package
SSO20
SSO20
Remarks
Tube, lead free
Taped and reeled, lead free
11
4651E–CELL–07/06