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Host: Power down DC comparators in LMS to improve Rx linearity (as per FAQ).

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This commit is contained in:
Alexander Chemeris
2014-04-19 23:39:56 +04:00
committed by Josh Blum
parent 2d5c88d624
commit 483e31af48
1 changed files with 14 additions and 0 deletions
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14
host/lms6002d.cpp
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@@ -172,6 +172,11 @@ void lms6002d_dev::init()
write_reg(0x64, 0x36); // Common Mode Voltage For ADC’s
write_reg(0x79, 0x37); // Higher LNA Gain
// Power down DC comparators to improve the receiver linearity
// (see FAQ v1.0r12, 5.26)
lms_set_bits(0x6E, (0x3 << 6));
lms_set_bits(0x5F, (0x1 << 7));
// Disable AUX PA
// PA_EN[0]:AUXPA = 0 (powered up) - for mask set v1
// PD_DRVAUX = 0 (powered up) - for mask set v0, test mode only
@@ -243,6 +248,10 @@ int lms6002d_dev::general_dc_calibration_loop(uint8_t dc_addr, uint8_t calibrati
int lms6002d_dev::general_dc_calibration(uint8_t dc_addr, uint8_t calibration_reg_base)
{
// Power up DC comparators
lms_clear_bits(0x6E, (0x3 << 6));
lms_clear_bits(0x5F, (0x1 << 7));
// Set DC_REGVAL to 31
write_reg(calibration_reg_base+0x00, 31);
// Run the calibration first time
@@ -266,6 +275,11 @@ int lms6002d_dev::general_dc_calibration(uint8_t dc_addr, uint8_t calibration_re
}
}
// Power down DC comparators to improve the receiver linearity
// (see FAQ v1.0r12, 5.26)
lms_set_bits(0x6E, (0x3 << 6));
lms_set_bits(0x5F, (0x1 << 7));
if (verbosity > 0) printf("Successful DC Offset Calibration for register bank 0x%X, DC addr %d. Result: 0x%X\n",
calibration_reg_base, dc_addr, DC_REGVAL);
return DC_REGVAL;