AN1602 Freescale Semiconductor / Motorola, AN1602 Datasheet - Page 2

• Manufacturer Part Number: AN1602
• Description: AN1602 Application Note: Dual-Band PA Application w/DECT Capability Using Std RFICs
• Manufacturer: Freescale Semiconductor / Motorola

MC33169 FUNCTIONALITY
generation and regulation, direct drive of the N–channel drain
switch transistor, a complete priority management system,
and other possible facilities which are very useful for
battery–operated designs ranging from 2.7 to 7.5 V. There
are two possible modes of operation.
Mode 1: Negative Supply Continuous Operation
3.0 V (logic “1”) during the entire transmitting period (even
between bursts). Transmit burst shaping and output power
control is implemented by applying the correct ramping
voltage to the V
V
designs, the doubled or tripled voltages are useful for
2
BB
The MC33169 integrated circuit provides negative voltage
In Mode 1 of operation, the IDLE pin is connected to 2.7 or
Higher DC voltages are available from the V
triple pins on the MC33169. For low battery voltage
ramp
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Freescale Semiconductor, Inc.
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Figure 2. Dual Band Application Timing Sequence
For More Information On This Product,
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Go to: www.freescale.com
double and
MOTOROLA SEMICONDUCTOR APPLICATION INFORMATION
operating a RF power switch. More than 3.0 mA of current is
available from these pins.
Mode 2: Negative Supply Burst Operation
the desired output power; however, the Idle pin controls the
MC33169 negative generator start–up. Some energy can be
saved with this arrangement because the negative supply
operates only during the transmit burst.
then slightly lower but are still large enough to supply the
MRFIC0903 during the burst, or to drive the VCO’s varactor
with a low current system. In this board an ENSWT signal is
provided, allowing the drive of power switch between 3.0 V
and –4.0 V, which is large enough to drive the MRFIC0903.
shown in Figure 2.
In Mode 2 of operation, the V
The currents available from V
The timing control sequence in Mode 2 of operation is
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ramp
BB
is still a linear function of
double or V
BB
triple are