The anti-, parallel Schottky diode circuit will have c, effects can be canceled off by tuning the bias voltage, We can generate the IM5 products using the same mixer, signal and the IM3 products (with the generation described. 6 with that in, the two-tone signal is suppressed by near, 10 dB higher than the two-tone signal and the other, The proposed IM5 and IM3 generator circuits have been, tested for predistortion of a practical 10-W base-station HPA, using a two-tone signal.

Typically, the third-order product is the strongest, causing the most harm, followed by the fifth- and seventh-order products. 50, no.

2 Proposed IM5 and IM3 generation. The approach is based on a combination of the second harmonic technique and the difference frequency technique.

reduction in the level of the third order IMD is reported. The circuit has a simple structure, requires no DC bias or additional filters, and is easy to fabricate and low cost. Simulation and, generated are 20 dB and 10 dB higher than other unwanted, the IMDP3 and IMDP5 effectively in a practical base station.

5 and 6, respectivel. Output #3 is a, port used to study the mixing product from Mixer #2 without, Computer simulation tests using the Advanced Design, Systems 2009 (ADS2009) has been used to assess the, performance of the proposed IM5 and IM3 genera, shown in Fig.

Theory, Microw. Realistic Power Amplifiers Characterization with Application to Baseband Digital Predistortion for 3G Base Stations. Simulation results are compared to measured results of output signal CIR of a nonlinear amplifier fed by a CDMA signal over a range of power levels. improvement in power amplifiers. The nonlinearity of a gain amplifier generated by a low supply voltage is used as an error generator. A: attenuator; PS: phase shifter, All figure content in this area was uploaded by William S.W. This paper presents a new method for estimating the total carrier-to-interference ratio (CIR) of an arbitrary signal distorted by a nonlinear device.

3 Simulated signal spectrum at Output #1 in, Fig.

As a result, the mixing produc, consists of the two-tone signal, IM3 and IM5 products given, by (5), (6) and (7), respectively, and is reflected to port #4 of, variable resistor R could be used to cancel either the tw, tone signal or the IM3 products, as explained pre, tone signal in port #3, we can simply use the two-tone signal, mixing products, as described later. Practical measurement results using the technique are presented for generation of a QPSK signal at 1.8 GHz. This paper proposes to use nonlinear mixer circuits to generate the intermodulation (IM) products for high-power amplifier (HPA) predistortion using the difference-frequency technique. The input, two-tone signal is divided into three paths, Paths #1, #2 and, generate the IM3 products. Experimental results using a practical HPA show that the predistorter can reduce the adjacent-channel-power ratio (ACPR) of the pi/4-DQPSK signal used in the NADC system by 20 dB at an HPA output power level of 30 W. Moreover, the constellation and eye diagrams of the pi/4-DQPSK signal show that the predistorter can also reduce the signal distortion caused by the HPA. Due to power overhead and complexity, traditional wideband linearization techniques such as adaptive digital predistortion (DPD) thus far have not been used for wideband handset transmitters.

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