Utilizing a Bandpass Filter for Specific Frequency Range
Bandpass filter are commonly employed to allow frequencies within a designated frequency range to pass through. When a high-performance opamp is utilized, such a filter can operate effectively at relatively high frequencies. The provided schematic diagram, the chosen opamp is the OPA603, a fast current-feedback opamp boasting a bandwidth of 100 MHz for gain values ranging from 1 to 10 (0 to 20 dB). In cases where the circuit needs to handle a narrow range of frequencies, as in this scenario, the gain can be increased. In both a current-feedback opamp and an ordinary opamp. The gain is determined by the negative feedback between the output and the inverting input. Additionally, the impedance of the feedback network plays a crucial role in determining the open-loop gain and the frequency response.
Configuring Filter Parameters
In the provided schematic diagram, signals outside the specified passband are attenuated by 22 dB. The filter’s central frequency is set at 10 MHz. It’s worth noting that the center frequency can be adjusted using the indicated formula. However, it’s crucial to bear in mind that 10 MHz represents the upper limit of the frequency range for which this circuit is suitable. The circuit can be powered using a supply voltage of ±15 V.
High-Speed Performance of OPA603
The OPA603 stands out as a high-speed current-feedback operational amplifier, offering guaranteed specifications for both ±5V and ±15V power supplies. It boasts the capability to deliver complete ±10V signals into 150Ω loads, featuring an impressive 1000V/µs slew rate. This exceptional performance allows it to effectively drive terminated 75Ω cables. With a peak output current capacity of 150mA, it becomes well-suited for driving load capacitance or extended lines at high speeds. Unlike conventional op-amps, the current feedback approach ensures nearly constant bandwidth and settling time across a wide range of closed-loop voltage gains. The OPA603 is conveniently available in plastic 8-pin DIP and SO-16 surface-mount packages, with specifications guaranteed over the industrial temperature range.
- WIDE SUPPLY RANGE: ±4.5 to ±18V
- BANDWIDTH: 100MHz, G = 1 to 10
- SLEW RATE: 1000V/µs
- FAST SETTLING TIME: 50ns to 0.1%
- HIGH OUTPUT CURRENT: ±150mA peak
- HIGH OUTPUT VOLTAGE: ±12V
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