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  • AN721: Impedance Matching Networks Applied to RF Power Transistors, Courtesy of Motorola
    be considered as a corollary of the matching circuit. Matching is necessary for the best possible energy transfer from stage to stage. In RF-power transistors the input impedance is of low value, decreasing as the power increases, or as the chip size becomes larger. This impedance must be matched
  • Distortion and source impedance in JFET-input op amps
    of two JFET-input op amps for high and low source impedance. A new fabrication process that limits common mode capacitance provides more device options when low distortion is required over a wide range of source impedance.
  • Matching circuit optimization for antenna applications
    Impedance matching is an essential part of antenna design. The input impedance of an antenna needs to be reasonably close to the amplifier impedance (e.g. 50 Ohm), otherwise the signal is reflected back to the amplifier and not radiated by the antenna.
  • Calculating Settling Time for Switched Capacitor ADCs
    Many of Silicon Lab's devices feature an on-chip SAR analog-to-digital converter (ADC). These ADC's use a sample capacitor that is charged to the voltage of the input signal that is used by the SAR logic to perform its data conversion. Due to the ADC's sample capacitance, input impedance
  • How to Monitor Sensor Health with Instrumentation Amplifiers
    By their very nature, in amps are a good choice to condition small signals in the presence of large common-mode voltages and DC potentials. The three op amp instrumentation amplifier architecture performs this function with the input stage providing a high input impedance while the output stage
  • Piezoelectric Measurement System Comparison: Charge Mode vs. Low Impedance Voltage Mode (LIVM)
    Piezoelectric sensors (Transducers) measure dynamic phenomena such as force, pressure and acceleration (including shock and vibration). Inside the sensor, piezoelectric materials such as quartz and man-made ceramics are stressed in a controlled fashion by the input measurand i.e., the specific
  • Application Advantages of LBA Differential Pressure Sensors Due to Their Very High Pneumatic Impedance
    principle of inferring differential pressure from a thermal mass flow measurement. The LBA pressure sensors can achieve very high pneumatic impedances up to 200,000 Pa/(ml/s). This reduces the gas flow through the sensor to an absolute minimum and allows high immunity to dust contamination
  • Inductor-Based Step-Up Switching Regulators
    is located far away from the switching regulator or its input impedance is high, the PWM in the regulator increases the on time of the switching transistor to compensate for the voltage drop due to the internal impedance of the source or long power connection(s). The negative input resistance of any

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