Abstract:
A receiver (100) for an N-wire digital interface (350), where N is any integer exceeding two, comprises N input terminals (101, 102, 103), a common node (120) and N detection stages (D1, D2, D3). Each of the N detection stages (D1, D2, D3) comprises a resistive element (R1, R2, R3) coupled between the common node (120) and a respective one of the N input terminals (101, 102, 103), and a comparator (C1, C2, C3) having a first input (121, 123, 125) coupled to the respective one of the N input terminals (101, 102, 103) and a second input (122, 124, 126) coupled to the common node (120).
Abstract:
A receiver (100) for a three-wire digital interface, comprises a first resistive element (R1) coupled between a first input terminal (A) and a first junction node (JA), a second resistive element (R2) coupled between a second input terminal (B) and a second junction node (JB), and a third resistive element (R3) coupled between a third input terminal (C) and a third junction node (JC). A network (70) comprising first second and third network terminals (71, 72, 73) is coupled to, respectively, first, second and third junction nodes (JA, JB, JC). The network has substantially the same impedance between all pairs of the first, second and third network terminals. A first comparator (C1) has a non-inverting input (10) coupled to the first input terminal (A), an inverting input (12) coupled to the second junction node (JB), and an output (14) coupled to a first output terminal (AJ). A second comparator (C2) has a non-inverting input (20) coupled to the first input terminal (A), an inverting input (22) coupled to the third junction node (JC), and an output (24) coupled to a second output terminal (AK). A third comparator (C3) has a non-inverting input (30) coupled to the second input terminal (B), an inverting input (32) coupled to the third junction node (JC), and an output (34) coupled to a third output terminal (BJ). A fourth comparator (C4) has a non-inverting input (40) coupled to the second input terminal (B), an inverting input (42) coupled to the first junction node (JA), and an output (44) coupled to a fourth output terminal (BK). A fifth comparator (C5) has a non-inverting input (50) coupled to the third input terminal (C), an inverting input (52) coupled to the first junction node (JA), and an output (54) coupled to a fifth output terminal (CJ). A sixth comparator (C6) has a non-inverting input (60) coupled to the third input terminal (C), an inverting input (62) coupled to the second junction node (JB), and an output (64) coupled to a sixth output terminal (CK).
Abstract:
A signal filter (100) comprises a first transferred impedance filter, TIF, (TIF A ) having four differential signal paths (P A,1 , P A,2 , P A,3 , P A,4 ) and a second TIF (TIF B ) having four differential signal paths (P B,1 , P B,2 , P B,3 , P B,4 )- A first differential signal port of the first TIF (32 A ) is coupled to a first differential signal port of the second TIF (32 B ). A first clock generator (12 A ) is arranged to provide first-TIF clock signals (CLK A,I+ , CLK A,Q+ , CLK A,I- , CLK A,Q- ) having four non-overlapping phases for selecting the respective first-TIF differential signal paths (P A,1 , P A,2 , P A,3 , P A,4 ), and a second clock generator (12 B ) is arranged to provide second-TIF clock signals (CLK B,I+ , CLK B,Q+ , CLK B,J- , CLK B,Q- ) having four non-overlapping phases for selecting the respective second-TIF differential signal paths (P B,1 , P B,2 , P B,3 , P B,4 ). The phases of the second-TIF clock signals (CLK B,I+ , CLK B,Q+ , CLK B,I- , CLK B,Q- ) are equal to the phases of the first-TIF clock signals (CLK A,I+ , CLK A,Q+ , CLK A,I- , CLK A,Q- ) delayed by 45 degrees. The first-TIF first, second, third and fourth clock signals (CLK A,I+ , CLK A,Q+ , CLK A,I- , CLK A,Q- -) and the second-TIF first, second, third and fourth clock signals (CLK B,I+ , CLK B,Q+ , CLK B,I- , CLK B,Q- ) have a duty cycle in the range 16.75% to 25%.
Abstract:
Continuous-time MASH sigma-delta ADC with a first modulator with 1.5 bit and a second modulator with 1 bit each receiving also the feedback from the other modulator. Sampling is at higher rate at the second modulator and decimation is performed before summing its output to the output of the first modulator.