AK1599V Datasheet, PDF (19/41 Pages) Asahi Kasei Microsystems – RF Transmitter for Satellite Communication

9.7. Loop Filter
Fig. 10 shows loop filter topology used to evaluate AK1599V.
[AK1599V]
Phase Detector
up
down
Timer
CPOUT
Loop Filter
R3
C1
R2
C3
C2
VCO
VCNT
Fig.10 Loop Filter
9.8. Quadrature Modulator
AK1599V consists of Quadrature Modulator, RF amplifier, and Programmable attenuator. A polarity of
Quadrature Modulator is as follows. Recommended DC bias Voltage to Baseband I/Q Input is
0.5V±0.025V.
Fig.11 Block diagram of internal Quadrature Modulator
9.9. SPI & Register
AK1599V contains Serial Peripheral Interface (SPI) which provides write and read access to internal
registers that are used to configure the device.
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