RF Transmitter

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RF Transmitter / ?????
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Schematic of Mixer VGA

• In Mixer
• High rejection to distortions

• In VGA
• Dynamic Range 33 dB
• On-chip Balun for differential-to-single
  conversion

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Simulation Measurement Result
Output Power 3.4 dBm
TOR 62.5 dB
Simulated Gain _at_ each step
Simulated Output Spectrum
Measured Output Spectrum for 802.11a
Measured Gain Range 27.7 dB
Measured OP1dB 3.5 dBm
Measured OIP3 15 dBm
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Layout of RF Transmitter
1.1 mm
2.4 mm

• Special structure of up-conversion mixer to
  improve linearity.
• Special approach in VGA to achieve linear-in-dB
  gain range.
• On-chip balun for differential-to-single
  conversion, easy connection with PA.