Input | Output | Supply | |||
---|---|---|---|---|---|
ViMin | ViMax | VoMin | VoMax | Vcc | Vee |
–2.45V | +2.45V | 0.05V | 4.95V | 5V | 0V |
Gain | Cutoff Frequency (fc) | Max Frequency (fmax) | Vref |
---|---|---|---|
–1V/V | 1kHz | 10kHz | 2.5V |
Design Description
The multiple-feedback (MFB) high-pass (HP) filter is a 2nd-order active filter. Vref provides a DC offset to accommodate for single-supply applications. This HP filter inverts the signal (Gain = –1V/V) for frequencies in the pass band. An MFB filter is preferable when the gain is high or when the Q-factor is large (for example, 3 or greater).
Design Notes
Design Steps
The first step in design is to find component values for the normalized cutoff frequency of 1 radian/second. In the second step, the cutoff frequency is scaled to the desired cutoff frequency with scaled component values.
The transfer function for a 2nd-order MFB high pass filter is given by:
The TLV9062 device has GBW of 10MHz and SR of 6.5V/µs, so the requirements are met.
Design Simulations
AC Simulation Results
Transient Simulation Results
Design References
Design Featured Op Amp
TLV9062 | |
---|---|
Vss | 1.8V to 5.5V |
VinCM | Rail-to-Rail |
Vout | Rail-to-Rail |
Vos | 0.3mV |
Iq | 538µA |
Ib | 0.5pA |
UGBW | 10MHz |
SR | 6.5V/µs |
#Channels | 1, 2, 4 |
www.ti.com/product/TLV9062 |
Design Alternate Op Amp
TLV316 | OPA325 | |
---|---|---|
Vss | 1.8V to 5.5V | 2.2V to 5.5V |
VinCM | Rail-to-Rail | Rail-to-Rail |
Vout | Rail-to-Rail | Rail-to-Rail |
Vos | 0.75mV | 0.150mV |
Iq | 400µA | 650µA |
Ib | 10pA | 0.2pA |
UGBW | 10MHz | 10MHz |
SR | 6V/µs | 5V/µs |
#Channels | 1, 2, 4 | 1, 2, 4 |
www.ti.com/product/TLV316 | www.ti.com/product/OPA325 |
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