NBB-301 RFMD [RF Micro Devices], NBB-301 Datasheet
NBB-301
Related parts for NBB-301
NBB-301 Summary of contents
Page 1
... RFMD’s NBB-series amplifiers are monolithic integrated circuits (IC's) using InGaP/GaAs HBT technology. The NBB-series uses a Darlington-pair transistor configuration with bias and feedback resistors properly selected to deter- mine the gain, input and output match and bias (both voltage and current) parameters. A schematic representation of the NBB-series amplifier is shown in Figure 1 ...
Page 2
... CC BE3 15 Figure 3. The family of NBB-series amplifiers is biased using a current source (left). The simplest current source is a resistor connected to a voltage source (middle). Alternatively, a current steering circuit (right) may be used as well to produce a constant current (see Sedra and Smith, Microelectronic Circuits, 2nd Ed., page 508). ...
Page 3
... Table 2. Summary of the dependence of the amplifier output voltage (V The coefficient of the change in device voltage (V tabular data. The negative coefficient indicates that the device voltage decreases with increasing current. Device Voltage (V Model Amplifier Number Current (mA) -45°C NBB-300 50 NBB-301 NBB-400 50 NBB-401 NBB-410 65 NBB-500 35 Copyright 1997-2002 RF Micro Devices, Inc ...
Page 4
... ----------- - -------------------------------------- = T V ----------- - R + BIAS I CC For example, an NBB-400 biased from a 5V supply (V change with respect to temperature, I – – 2.8 CC ----------- - ------------------- - = = 0.108mA which translates into a variation of 14mA over the temperature range from -40°C to +85°C. By comparison 12V sup- ply rail is with a 162 bias resistor, then a change in current with respect to temperature reduces to 0.016mA/° ...