Content for TS 37.461 Word version: 18.0.0
4.4 DC power supply
4.4.1 Power consumption
4.4.2 Conducted emission
4.4.3 Power-up characteristics
A Test procedures
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4.4 DC power supply p. 14
4.4.1 Power consumption p. 14
The DC supply requirements refers to reference points 3 and 5 in subclause 4.3.
BS modem and an antenna modem shall be able to operate with a DC supply voltage range of 10 V - 30 V.
Power consumption modes are specified in Table 4.4.1.1 and Table 4.4.1.2.
| RET Power mode | Maximum power consumption |
|---|---|
| High | < 13 W |
| Low | < 2 W |
| TMA Type | Maximum power consumption |
|---|---|
| Single Unit | < 7,5 W |
| Multi Unit (N) | < N * 7,5 W |
BS modem and antenna modem maximum power consumption shall be < 2 W.
BS modem and antenna modem shall impose a voltage drop less than 2 V between reference point 3 and 5.
A Single Unit considers one RF amplifier in one TMA. A Multi Unit considers N RF amplifiers in equal or less than N TMAs.
4.4.2 Conducted emission p. 14
The levels of generated conducted noise and ripple on DC Power supply shall be within the limits given in Table 4.4.2.1.
| Item | Limit | Frequency | Remarks |
|---|---|---|---|
| RET power mode High | 70 mVpp | 0.15 - 30 MHz | Only one operating unit a time |
| RET power mode Low | 20 mVpp | 0.15 - 30 MHz | |
| TMA | 20 mVpp | 0.15 - 30 MHz | |
| Antenna modem, RF port | 15 mVpp | 0.15 - 30 MHz | Generated Noise and Ripple at RF feeder (in RX mode) |
| Antenna modem, DC port | 20 mVpp | 0.15 - 30 MHz | Allowed Noise and Ripple at external DC port (in TX mode) |
All units connected to a DC supply bus shall exhibit full performance up to the limit of 112 mVpp total noise and ripple within 0.15 - 30 MHz.
4.4.3 Power-up characteristics p. 14
A BS modem, antenna modem or RET/TMA control units shall have a power-up period of 3 s.
During the power-up period a BS modem, antenna modem or a RET control unit shall exhibit the circuit equivalent of a DC power consumer with a current consumption of maximum 400 mA in parallel with a capacitor of maximum 0.5 μF.
During the power-up period the TMA control unit shall exhibit the circuit equivalent of a DC power consumer with a current consumption of maximum 1A in parallel with a capacitor of maximum 0.5 μF.
After the power-up period, the unit shall be fully functional and the power consumption requirement as described in subclause 4.4.1 applies.
A (Normative) Test procedures p. 16
Test pattern
Spectrum mask and emission requirement shall be tested both with a consecutive series of "0" and an alternating sequence of "0" and "1".
Emission requirement below noise floor
As a general rule, the resolution bandwidth of the measuring equipment should be equal to the measurement bandwidth. However, to improve measurement accuracy and sensitivity when measuring close to or below the noise floor, the resolution bandwidth may be smaller than the measurement bandwidth. When the resolution bandwidth is smaller than the measurement bandwidth, the result should be integrated over the measurement bandwidth in order to obtain the equivalent noise bandwidth of the measurement bandwidth.
Conversion between modulated and CW for IM measurement
The requirement for IM3 below 1 GHz shall be relaxed 15 dB and tested with CW interferers at the specified levels.
The requirement for IM3 above 1 GHz shall be relaxed 5 dB and tested with CW interferers at the specified levels.
The requirement for IM5 or higher below 1 GHz shall be relaxed 10 dB and tested with CW interferers at the specified levels.
The requirement for IM5 or higher above 1 GHz shall be relaxed 0 dB and tested with CW interferers at the specified levels.
Example: A -130 dBm/100 kHz requirement below 1 GHz with two WCDMA-modulated carriers at 43 dBm is converted to a -115 dBm requirement with two CW carriers at 43 dBm.
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