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HMPP-389X-TR1 Datasheet(PDF) 4 Page - Broadcom Corporation. |
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HMPP-389X-TR1 Datasheet(HTML) 4 Page - Broadcom Corporation. |
4 / 12 page 4 RF COMMON RF 2 RF 1 BIAS 2 3 4 1 2 3 4 1 3 4 1 2 Figure 8. Very High Isolation SPDT Switch, Dual Bias. Typical Applications RF COMMON RF 1 1 2 3 4 BIAS 1 RF 2 BIAS 2 RF COMMON RF 2 BIAS RF 1 2 3 4 1 2 3 4 1 Figure 6. Simple SPDT Switch Using Only Positive Bias. Figure 7. High Isolation SPDT Switch Using Dual Bias. Bulk Attenuator Diode Epi Switching Diode P+ Diffusion Bulk I-Layer N+ Diffusion Metal Contact Contact Over P+ Diffusion N+ Substrate Epi I-Layer Figure 9. PIN Diode Construction. Applications Information PIN Diodes In RF and microwave networks, mechanical switches and attenuators are bulky, often unreliable, and difficult to manufacture. Switch ICs, while convenient to use and low in cost in small quantities, suffer from poor distortion performance and are not as cost effective as PIN diode switches and attenuators in very large quantities. For over 30 years, designers have looked to the PIN diode for high performance/low cost solutions to their switching and level control needs. In the RF and microwave ranges, the switch serves the simple purpose which is implied by its name; it operates between one of two modes, ON or OFF. In the ON state, the switch is designed to have the least possible loss. In the OFF state, the switch must exhibit a very high loss (isolation) to the input signal, typically from 20 to 60 dB. The attenuator, however, serves a more complex func- tion. It provides for the“soft”or controlled variation in the power level of a RF or microwave signal. At the same time as it attenuates the input signal to some predetermined value, it must also present a matched input impedance (lowVSWR) to the source. Every microwave network which uses PIN diodes (phase shifter, modulator, etc.) is a varia- tion on one of these two basic circuits. One can see that the switch and the attenuator are quite different in their function, and will therefore often require different characteristics in their PIN diodes. These proper- ties are easily controlled through the way in which a PIN diode is fabricated. See Figure 14. |
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