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TSH690 Datasheet(PDF) 8 Page - STMicroelectronics |
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TSH690 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 14 page TSH690 8/14 DETERMINING VBIAS AND R1 AT 450 MHz Using the 450 MHz curves, you can easily deter- mine VBIAS voltage and R1 to obtain the desired power gain S21. For a given gain S21 and a given supply voltage VCC, you can determine the corresponding VBIAS.using the curve ’Gain vs VBIAS’ in the ’450 MHz operation’ section. It’s generally more convenient to supply the Vbias from VCC than generate a separate voltage. You just need to add the R1 resistor beetween the VBIAS pin and VCC. Using the curve ’Supply current vs Bias voltage’ you can determine the current IBIAS corresponding to a VBIAS . R1 can calculated by: R1 = (VCC - VBIAS ) / IBIAS. One the same curve, you will find the total current supply Icc versus the biasing conditions. Figure 5 : Demo board silk screen (not to scale) Figure 6 : Demo board top side (not to scale ) |
Número de pieza similar - TSH690_01 |
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Descripción similar - TSH690_01 |
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