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Micrel, Inc.
Transmitter
Power Amplifier
The maximum output power of the power amplifier (PA) is
approximately 10dBm with a 50? load. For maximum
output power, the load seen by the PA must be resistive.
Higher output power can be obtained by decreasing the
load impedance, but this will conflict with impedance
matching to the LNA.
The output power is programmable in seven levels by
means of the PA[2:0] field, with approximately 2.5dB
between steps; see Table 17. The power amplifier is
turned off when PA[2:0] = 000. Otherwise the PA is on and
output power increases with the value of the PA[2:0] field
and is maximum when PA[2:0] = 111.
MICRF507
Setting PA_by=1 causes the PA to be bypassed and
output power to drop by ~22dB. It is still possible to control
the power with PA[2:0] bits.
The LC filter shown in Figure 18 reduces harmonic
emission when placed between the ANT pin and antenna.
Field Name
Modulation
Mod_I
Mod_A
Mod_F
PA
PA_by
Number
of bits
2
5
4
3
3
1
Location
of bits
Reg1[7:6]
Reg4[4:0]
Reg5[3:0]
Reg4[7:5]
Reg0[6:4]
Reg2[4]
Description
Modulation selection
Modulator current setting
Modulator attenuator setting
Modulator filter setting
Power amplifier level
Bypass of PA stage on/off
Reference
Table 18
Table 17
Table 17
Table 16. Register Bit Fields for Transmitter and VCO Modulation
PA2
0
0
0
0
1
1
1
1
PA1
0
0
1
1
0
0
1
1
PA0
0
1
0
1
0
1
0
1
State (approximate attenuation)
PA off
15dB attenuation
12.5dB attenuation
10dB attenuation
7.5dB attenuation
5dB attenuation
2.5dB attenuation
Max output
PA_By
0
1
Power Amplifier Enabled
Power Amplifier bypassed, approx 20dB reduced output power.
Table 17. Register Bit Fields for Power Amplifier
October 2, 2013
28
Revision 2.2
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