This is a Programmable 2nd-Order Sallen-Key Filter designed in the Skywater 130nm Sky130A process. The filter has selectable programmable low-pass, band-pass, and high-pass Butterworth, Chebyshev, and Bessel characteristics, up to third order.
| Pin name | Use | Voltage Domain |
|---|---|---|
| avdd | analog power | 3.3V |
| dvdd | digital power | 1.8V |
| avss | analog ground | |
| dvss | digital ground | |
| ena | enable | dvdd domain |
| Parameter | Min | Typical | Max | Unit | Notes |
|---|---|---|---|---|---|
| Operating Temperature | -40 | 25 | 85 | °C | |
| Programmable Frequency Range | 20 | - | 20000 | Hz | To cover the full audible range |
| Filter Types | Low-pass, Band-pass, High-pass | ||||
| Filter Characteristics | Bessel, Chebyshev, Butterworth | ||||
| Quality Factor (Q) Range | 0.5 | 1 | 3 | Higher Q for sharper band-pass | |
| Gain Range | -6 | 0 | 6 | dB | Adjustable; negative values for attenuation |
| Total Harmonic Distortion | - | 0.01 | 0.1 | % | At nominal input levels |
| Signal-to-Noise Ratio | 70 | 90 | 110 | dB | |
| Input Impedance | 10 | 47 | 100 | kΩ | |
| Output Impedance | 100 | 600 | 1 | kΩ | |
| Programmability Interface | Wishbone bus interface to register set | ||||
| Power Consumption | 1 | 5 | 10 | mA | Depends on the load and filter settings |
| Adjustable Parameters | Cutoff frequency, Q factor, filter type, and characteristics |
EF_SALLEN-KEY-FILTER
Vendor
Efabless
130nm
Skywater
Filter
Free
Open Source
EF Certified
Defined