# Editing RF-Amp

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Latest revision | Your text | ||

Line 119: | Line 119: | ||

** C=0.1uF | ** C=0.1uF | ||

** F=10MHz | ** F=10MHz | ||

− | ** 1/2*pi*F*C = 0. | + | ** 1/2*pi*F*C = 0.16 ohms |

* Parallel resistors R1, R2 paralleled with transistor input impedance | * Parallel resistors R1, R2 paralleled with transistor input impedance | ||

− | ** R1= | + | ** R1=15K, R2=3.3K |

** Transistor resistance = Beta AC (33.3) times re | ** Transistor resistance = Beta AC (33.3) times re | ||

*** re = 26 / Ie (10 mA in mA) = 26/10 = 2.6 | *** re = 26 / Ie (10 mA in mA) = 26/10 = 2.6 | ||

*** SSDRA uses 25 as constant - close enough | *** SSDRA uses 25 as constant - close enough | ||

**** 26 comes from Ebers-Moll approximation | **** 26 comes from Ebers-Moll approximation | ||

− | *** Beta AC * re = 33.3*2.6 = 83. | + | *** Beta AC * re = 33.3*2.6 = 83.3 ohms - predominates |

− | ** All in parallel are 80. | + | ** All in parallel are 80.8 ohms |

=== Gain calculation === | === Gain calculation === |