The OP5000 is a Crest Factor Reduction (CFR) IC with a configurable squelching engine that reduces a signal's peak-to-average power ratio (PAR) while maintaining acceptable error vector magnitude (EVM). It supports two 16-bit, CMOS input busses for I and Q data which runs up to 125 Msps. The signal's input sampling rate can be increased by 2x, 3x or 4x by using the IC's interpolator. Six channel error filters, each configurable for window type and length, can be allocated using several options. One channel filter may be allocated to each carrier; or a single channel filter can be used when combining multiple carriers, treating the composite bandwidth as one large carrier. Chaining is also supported for applications that require sharper filtering. The OP5000 comes in a 14 X 14 mm BGA package that operates over the industrial temperature range and is lead-free and RoHS compliant.

The OP5000 is an ideal complement to Optichron's OP4400 low-cost family of digital pre-distortion devices (DPD). Although the CFR device greatly reduces PAR, it is only half of the equation. Since the PA itself is not affected by signal compression, its proprieties remain nonlinear. The solution is to correct the signal by using the OP4400. When used together, the CFR and DPD solution maximizes the PA's operating point on the output power curve, producing remarkable efficiency. Moreover, this combination improves in-band and out-of-band distortion.

OP5000 Performance with OP4400

OP5000 Block Diagram

WHEN LINEARITY MATTERS