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參數(shù)資料
| 型號： | RF2942 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | UHF QUADRATURE MODULATOR AND TRANSMITTER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, QCC16 |
| 封裝： | 4 X 4 MM, QFN-16 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大小： | 206K |
| 代理商： | RF2942 |
11-199
RF2942
Rev A4 040115
Theory of Operation
Modulator
The modulator is a direct conversion double balanced
quadrature mixer architecture. The local oscillator sig-
nal is buffered then split with internal phase shifters
that are optimized for twice the operating frequency.
The LO buffer provides isolation from load changes
that may occur as the power amplifier section is turned
on and off. In addition, the LO buffer may be left on
when the transmit section is turned off to prevent load
pulling of the external oscillator, by holding TX EN low
and leaving the bias on VCC1.
The baseband I and Q pins are connected to the inter-
nal mixer bias, therefore it is recommended that the
modulation signal be DC-blocked if a similar external
reference voltage cannot be provided. The baseband
drive may be either single-ended with the complemen-
tary input AC-grounded with a capacitor or driven dif-
ferentially.
Power Amplifier
The power amplifier requires matching on the output
(RF OUT) and the interstage transistor (PA VCC).
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