PENGUAT ISYARAT KECIL

PENGUAT ISYARAT KECIL

1. INTRODUCTION

   • 1. Operate with small input signal
     • 2. Power level than 1W
       • 3. Peak to peak ac current value is less than 0.1 times the amplifier input bias current

2. CB ( COMMON BASE AMPLIFIER)

   • 1. Have INPUT signal applied to the EMITTER TERMINAL and OUTPUT signal coming from the COLLECTOR TERMINAL
     • Both biasing requirements for BJT are met: 1. The base -emitter junction is FORWARD BIASED 2.The base-collector junction is REVERSED BIASED.

3. CE ( COMMON EMITTER AMPLIFIER)

   • 1. Input signal is introduced the BASE CIRCUIT.
     • 2. OUTPUT is taken from the COLLECTOR.
       • 3. OUTPUT circuit has medium impedance approximately 5K ohm
         • 4. Power Gain as high as 10K
           • 5. 180 degree phase reversal between the INPUT and OUTPUT signal

4. CC (COMMON COLLECTOR AMPLIFIER)

   • 1. The COLLECTOR is common to both the input and output
     • 2.INPUT circuit can have a very high impedance
       • 3. The circuit provides GOOD current gain, but LESS power gain.

5. FREQUENCY RESPONSE

   • 1. Measure of the output spectrum of a system or device in response to a stimulus and it use to characterize the dynamics of the system
     • 2. Measure using Hz .

6. POWER GAIN

   • 1. Ratio output : Input
     • 2. Measure of the ability of a two-port circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output port by adding energy converted from some power supply to the signal

7. MIXER CIRCUIT

   • 1. Electrical circuit which creates new frequencies from two signals that are applied to it
     • 2. Active mixers can increase the strength of the product signal.
       • 3.Passive mixers can use one diode or more and rely on the non-linear relation between current and voltage in order to provide the multiplying element.