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參數(shù)資料
| 型號(hào)： | TDA5251F1 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ASK/FSK 315MHz Wireless Transceiver |
| 中文描述： | 詢(xún)價(jià)/ FSK信號(hào)315MHz的無(wú)線收發(fā)器 |
| 文件頁(yè)數(shù)： | 42/88頁(yè) |
| 文件大?。?/td> | 2086K |
| 代理商： | TDA5251F1 |
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TDA5251 F1
Version 1.0
Application
Preliminary Specification
42
2003-02-18
Confidential
3.1.4
Power-Amplifier
The power amplifier operates in a high efficient class C mode. This mode is characterized by a
pulsed operation of the power amplifier transistor at a current flow angle of << . A frequency
selective network at the amplifier output passes the fundamental frequency component of the pulse
spectrum of the collector current to the load. The load and its resonance transformation to the
collector of the power amplifier can be generalized by the equivalent circuit of
Figure 3-6
. The tank
circuit L//C//RL in parallel to the output impedance of the transistor should be in resonance at the
operating frequency of the transmitter.
Equivalent_power_wmf.
Figure 3-6
Equivalent power amplifier tank circuit
The optimum load at the collector of the power amplifier for “critical” operation under idealized
conditions at resonance is:
A typical value of RLC for an RF output power of Po= 13mW is:
Critical” operation is characterized by the RF peak voltage swing at the collector of the PA transistor
to just reach the supply voltage V
S
. The high efficiency under “critical” operating conditions can be
explained by the low power loss at the transistor.
During the conducting phase of the transistor there is no or only a very small collector voltage
present, thus minimizing the power loss of the transistor (i
C
*u
CE
). This is particularly true for low
current flow angles of <<
In practice the RF-saturation voltage of the PA transistor and other
parasitics will reduce the “critical” R
LC
.
V
S
R
L
C
L
0
2
2
P
S
V
LC
R
[3 – 8]
350
013
.
2
3
2
LC
R
[3 – 9]
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| TDA5251F1_07 | 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:ASK/FSK 315MHz Wireless Transceiver |
| TDA5251XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Transceiver ASK/FSK 2.5V/3.3V/5V T/R 制造商:Infineon Technologies AG 功能描述:CONTROL - Tape and Reel 制造商:Infineon Technologies AG 功能描述:TXRX FSK/ASK SGL LP TSSOP-38 |
| TDA5252 | 功能描述:射頻接收器 ASK/FSK WIRELESS TRANSCEIVER RoHS:否 制造商:Skyworks Solutions, Inc. 類(lèi)型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| TDA5252G2 | 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:ASK/FSK 915MHz Wireless Transceiver |
| TDA5252XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Transceiver ASK/FSK 2.5V/3.3V/5V 38-Pin TSSOP T/R 制造商:Infineon Technologies AG 功能描述:CONTROL - Tape and Reel 制造商:Infineon Technologies AG 功能描述:TXRX FSK/ASK SGL LP TSSOP-38 |
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