X3DC19E2S

X3DC19E2S Rev D Doherty Combiner Description: The X3DC19E2S is a low profile, high performance Doherty Combiner in a new easy to use, manufacturing friendly surface mount package. The X3DC19E2S is designed particularly for Doherty Amplifier applications, where tightly controlled phase and amplitude imbalance as well as low insertion loss are required for maximum and low power condition. It can be used in high power applications up to 200 watts. Parts have been subjected to rigorous qualification testing and they are manufactured using materials with coefficients of thermal expansion (CTE) compatible with common substrates such as FR4, G-10, RF-35, RO4350 and polyimide. Produced with 6 of 6 RoHS compliant tin immersion finish Features: • • • • • • • Electrical Specifications ** 1930 - 1990 MHz High Power Low Amp Imbalance Very Low Loss Production Friendly Tape and Reel Lead Free Frequency Return Loss [1] Insertion Loss [1] Amplitude Imbalance [1] Phase Imbalance [1] MHz dB Min dB Max dB Max Degrees 1930 – 1990 20 0.15 ±0.12 90 ± 3.0 Return Loss Insertion Loss [2] Port Extension[3] Power[4] Operating Temp. dB Min dB Max Degrees Avg. CW Watts ºC 20 0.20 9 200 -55 to +95 [2] **Specification based on performance of unit properly installed on TTM test board [1] At maximum power condition, Doherty combiner functions as an equal-split power combiner. [2] At low power condition, Doherty combiner functions as a 100Ω to 50Ω impedance transformer. [3] There are short 50 ohm lines associated with input ports of 9° at 1960MHz. Details in page 2. Mechanical Outline: 1 X3DC19E2S Rev D Doherty Amplifier Configuration Doherty Combiner Pin Configuration The X3DC19E2S has an orientation marker to denote Pin 1. Once port one has been identified the other ports are known automatically. Please see the chart below for clarification: Pin 1 Combining Port Pin 2 Not Used Pin 3 Peak Amp Port Pin 4 Main Amp Port There are inevitably short lines associating with input ports in some high frequency band parts. The length of the short line is specified as electrical length at center frequency and noted as port extension in this datasheet. The designer should take this length into the consideration to optimize the offset line length. 2 X3DC19E2S Rev D Typical Performance (-55°C, 25°C, 95°C): 1930 – 1990 MHz 0 Return Loss for X3DC19E2S (Maximum Power Condition) -55ºC 25ºC 95ºC -20 -30 -40 -50 1930 0 Return Loss for X3DC19E2S (Low Power Condition) -55ºC 25ºC 95ºC -10 Return Loss (dB) -10 Return Loss (dB) 0 -20 -30 -40 1940 1950 1970 1960 Frequency (MHz) 1980 -50 1930 1990 Insertion Loss for X3DC19E2S (Maximum Power Condition) 0 -55ºC 25ºC 95ºC -0.02 1940 1950 1970 1960 Frequency (MHz) 1980 1990 Insertion Loss for X3DC19E2S (Low Power Condition) -55ºC 25ºC 95ºC -0.05 Insertion Loss (dB) Insertion Loss (dB) -0.04 -0.06 -0.08 -0.1 -0.12 -0.1 -0.15 -0.2 -0.25 -0.14 1930 1940 1950 1970 1960 Frequency (MHz) 1980 1990 -0.3 1930 1940 1950 1970 1960 Frequency (MHz) 1980 1990 3 X3DC19E2S Rev D Phase Balance for X3DC19E2S -55ºC 25ºC 95ºC -86 -55ºC 25ºC 95ºC 0.15 0.1 Amplitude Balance (deg) -88 Phase Balance (deg) Amplitude Balance for X3DC19E2S 0.2 -90 -92 0.05 0 -0.05 -0.1 -0.15 -94 1930 1940 1950 1960 1970 Frequency (MHz) 1980 1990 -0.2 1930 1940 1950 1960 1970 Frequency (MHz) 1980 1990 4 X3DC19E2S Rev D Definition of the Specifications To guarantee the part performance in Doherty architecture, the part is specified in Doherty operation for maximum power condition and low power condition. The following specification definition assumes the extra port extension is already applied to the raw S parameter and the parts is measured with Pin n connected to Port n (where n=1, 2, 3, 4). Maximum power condition Under the maximum power condition, the symmetrical Doherty architecture requires main amplifier and peak amplifier to work at full capacity with the optimum termination (50 Ω). The two amplifiers should deliver RF power of equal magnitude and 90 degree phase difference. Doherty combiner functions as a coherent power combiner and supplies the 90 degree phase compensation. The following specification is defined with 50 Ω port impedance at three ports for this condition. The return loss and the insertion loss in max power mode are not affected by the 50 ohm lossless port rotation mentioned in electrical spec table in page 1. The phase imbalance and the amplitude imbalance are not affected either since port rotation are taken off equally from the main and the peak amp port. Parameter Definition Mathematical Representation Return Loss Insertion Loss Phase Imbalance Amplitude Imbalance The impedance match at the combining port to a 50Ω system. The combined power divided by the sum of input power under the perfect combining condition. The phase difference between Peak-Combined path and MainCombined path at ωc = 1960MHz. The magnitude difference between Peak-Combined path and Main-Combined path. Low power condition 20log| S11 | 10log(|S13 |2 + |S14 |2 ) Phase (S14 (ωc )) − Phase (S13 (ωc )) 1 (20log| S14 | − 20log| S13 |) 2 Under low power condition, the Doherty operation turns off peak amplifier and requires main amplifier to be terminated with double of the optimum impedance (100 Ω). In this configuration, Doherty combiner servers as an impedance transformer transforming 50 Ω at combining port to 100 Ω at main amplifier port. The following specification is defined under the port impedance condition of Port 1 (Combining Port) 50 Ω, Port 4 (Main Amp Port) 100 Ω and Port 3 (Peak Amp Port) open. With the peak amp left off, the extra line length in that port (see figure in page 2) acts as an open stub which shifts the low power mode return loss null and insertion loss. The offset line length needs to be adjusted taking the port rotation number into consideration so that the junction of 50 Ω and 35 Ω transmission line sees high impedance instead of the part edge. The return loss and the insertion loss defined below are after the offset line adjustments specified in the spec table. Parameter Definition Return Loss The impedance match of the 50 to100 Ω transformer. Insertion Loss The output power divided by input power. Mathematical Representation 20log| S11 | 20log| S41 | 5 X3DC19E2S Rev D Packaging and Ordering Information: Parts are available in reel. Packaging follows EIA 481-2. Parts are oriented in tape and reel as shown below. Minimum order quantities are 2000 per reel. .079 [2.00] .012 [0.30] Ø.059 [Ø1.50] .157 [4.00] .069 [1.75] .453 [11.50] .591 [15.00] Ø.059 [Ø1.50] .228 [5.80] .315 [8.00] XX XX .094 [2.40] .945 [24.00] Contact us: rf&s_support@ttm.com 6